{"id":8991,"date":"2023-09-22T16:15:08","date_gmt":"2023-09-22T08:15:08","guid":{"rendered":"\/?p=8991"},"modified":"2023-09-22T16:16:45","modified_gmt":"2023-09-22T08:16:45","slug":"%e4%b8%80%e6%96%87%e8%af%bb%e6%87%82%e5%8d%b3%e6%97%b6%e6%9b%b4%e6%96%b0%e6%96%b9%e6%a1%88%ef%bc%9asse","status":"publish","type":"post","link":"\/?p=8991","title":{"rendered":"\u4e00\u6587\u8bfb\u61c2\u5373\u65f6\u66f4\u65b0\u65b9\u6848\uff1aSSE"},"content":{"rendered":"<blockquote>\n<p>\ud83d\udd14\u6982\u8ff0\uff1a<\/p>\n<p>\u76f8\u8f83\u4e8e\u7e41\u91cd\u7684 WebSockets\uff0cSSE \u65e0\u7591\u662f H5 \u7b80\u5355\u5373\u65f6\u6570\u636e\u66f4\u65b0\u7684\u8f7b\u91cf\u7ea7\u4ee3\u66ff\u65b9\u6848\u3002<\/p>\n<\/blockquote>\n<h2>1 \u80cc\u666f<\/h2>\n<p>\u200b   \u5728\u4f7f\u7528 ChatGPT \u65f6\uff0c\u53d1\u73b0\u8f93\u5165 prompt \u540e\uff0c\u9875\u9762\u662f\u9010\u6b65\u7ed9\u51fa\u56de\u590d\u7684\uff0c\u8d77\u521d\u4ee5\u4e3a\u4f7f\u7528\u4e86 WebSckets \u6301\u4e45\u5316\u8fde\u63a5\u534f\u8bae\uff0c\u67e5\u770b\u5176\u7f51\u7edc\u8bf7\u6c42\uff0c\u53d1\u73b0\u8fd9\u4e2a\u63a5\u53e3\u7684\u901a\u4fe1\u65b9\u5f0f\u5e76\u975e\u4f20\u7edf\u7684 http \u63a5\u53e3\u6216\u8005 WebSockets\uff0c\u800c\u662f\u57fa\u4e8e EventStream \u7684\u4e8b\u4ef6\u6d41\uff0c\u50cf\u6253\u5b57\u673a\u4e00\u6837\uff0c\u4e00\u6bb5\u4e00\u6bb5\u7684\u8fd4\u56de\u7b54\u6848\u3002<\/p>\n<p>\u200b   ChatGPT \u662f\u4e00\u4e2a\u57fa\u4e8e\u6df1\u5ea6\u5b66\u4e60\u7684\u5927\u578b\u8bed\u8a00\u6a21\u578b\uff0c\u5904\u7406\u81ea\u7136\u8bed\u8a00\u9700\u8981\u5927\u91cf\u7684\u8ba1\u7b97\u8d44\u6e90\u548c\u65f6\u95f4\uff0c\u54cd\u5e94\u901f\u5ea6\u80af\u5b9a\u6bd4\u666e\u901a\u7684\u8bfb\u6570\u636e\u5e93\u8981\u6162\u7684\u591a\uff0c\u666e\u901a http \u63a5\u53e3\u7b49\u5f85\u65f6\u95f4\u8fc7\u957f\uff0c\u663e\u7136\u5e76\u4e0d\u5408\u9002\u3002\u5bf9\u4e8e\u8fd9\u79cd\u5355\u9879\u5bf9\u8bdd\u573a\u666f\uff0cChagtGPT \u5c06\u5148\u8ba1\u7b97\u51fa\u7684\u6570\u636e\u201c\u63a8\u9001\u201d\u7ed9\u7528\u6237\uff0c\u8fb9\u8ba1\u7b97\u8fb9\u8fd4\u56de\uff0c\u907f\u514d\u7528\u6237\u56e0\u4e3a\u7b49\u5f85\u65f6\u95f4\u8fc7\u957f\u5173\u95ed\u9875\u9762\u3002\u800c\u8fd9\uff0c\u53ef\u4ee5\u91c7\u7528 SSE \u6280\u672f\u3002<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/9aa1f0a25af8487284130e589ed9d2eftplv-k3u1fbpfcp-zoom-in-crop-mark1512000.gif\" alt=\"9aa1f0a25af8487284130e589ed9d2eftplv-k3u1fbpfcp-zoom-in-crop-mark1512000\" \/><\/p>\n<h2>2 \u6982\u8ff0<\/h2>\n<p>\u200b   Server-Sent Events \u670d\u52a1\u5668\u63a8\u9001\u4e8b\u4ef6\uff0c\u7b80\u79f0 SSE\uff0c\u662f\u4e00\u79cd\u670d\u52a1\u7aef\u5b9e\u65f6<strong>\u4e3b\u52a8<\/strong>\u5411\u6d4f\u89c8\u5668\u63a8\u9001\u6d88\u606f\u7684\u6280\u672f\u3002<\/p>\n<p>\u200b   SSE \u662f HTML5 \u4e2d\u4e00\u4e2a\u4e0e\u901a\u4fe1\u76f8\u5173\u7684 API\uff0c\u4e3b\u8981\u7531\u4e24\u90e8\u5206\u7ec4\u6210\uff1a\u670d\u52a1\u7aef\u4e0e\u6d4f\u89c8\u5668\u7aef\u7684\u901a\u4fe1\u534f\u8bae\uff08<code>HTTP<\/code> \u534f\u8bae\uff09\u53ca\u6d4f\u89c8\u5668\u7aef\u53ef\u4f9b JavaScript \u4f7f\u7528\u7684 <code>EventSource<\/code> \u5bf9\u8c61\u3002<\/p>\n<p>\u200b   \u4ece\u201c\u670d\u52a1\u7aef\u4e3b\u52a8\u5411\u6d4f\u89c8\u5668\u5b9e\u65f6\u63a8\u9001\u6d88\u606f\u201d\u8fd9\u4e00\u70b9\u6765\u770b\uff0c\u8be5 API \u4e0e WebSockets API \u6709\u4e00\u4e9b\u76f8\u4f3c\u4e4b\u5904\u3002\u4f46\u662f\uff0c\u8be5 API \u4e0e WebSockers API \u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>Server-Sent Events API<\/th>\n<th>WebSockets API<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u57fa\u4e8e HTTP \u534f\u8bae<\/td>\n<td>\u57fa\u4e8e TCP \u534f\u8bae<\/td>\n<\/tr>\n<tr>\n<td>\u5355\u5de5\uff0c\u53ea\u80fd\u670d\u52a1\u7aef\u5355\u5411\u53d1\u9001\u6d88\u606f<\/td>\n<td>\u5168\u53cc\u5de5\uff0c\u53ef\u4ee5\u540c\u65f6\u53d1\u9001\u548c\u63a5\u6536\u6d88\u606f<\/td>\n<\/tr>\n<tr>\n<td>\u8f7b\u91cf\u7ea7\uff0c\u4f7f\u7528\u7b80\u5355<\/td>\n<td>\u76f8\u5bf9\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u7f6e\u65ad\u7ebf\u91cd\u8fde\u548c\u6d88\u606f\u8ffd\u8e2a\u7684\u529f\u80fd<\/td>\n<td>\u4e0d\u5728\u534f\u8bae\u8303\u56f4\u5185\uff0c\u9700\u624b\u52a8\u5b9e\u73b0<\/td>\n<\/tr>\n<tr>\n<td>\u6587\u672c\u6216\u4f7f\u7528 Base64 \u7f16\u7801\u548c gzip \u538b\u7f29\u7684\u4e8c\u8fdb\u5236\u6d88\u606f<\/td>\n<td>\u7c7b\u578b\u5e7f\u6cdb<\/td>\n<\/tr>\n<tr>\n<td>\u652f\u6301\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7c7b\u578b<\/td>\n<td>\u4e0d\u652f\u6301\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7c7b\u578b<\/td>\n<\/tr>\n<tr>\n<td>\u8fde\u63a5\u6570 HTTP\/1.1 6 \u4e2a\uff0cHTTP\/2 \u53ef\u534f\u5546\uff08\u9ed8\u8ba4 100\uff09<\/td>\n<td>\u8fde\u63a5\u6570\u65e0\u9650\u5236<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>3 \u670d\u52a1\u7aef\u5b9e\u73b0<\/h2>\n<h3>3.1 \u534f\u8bae<\/h3>\n<p>\u200b   SSE \u534f\u8bae\u975e\u5e38\u7b80\u5355\uff0c\u672c\u8d28\u662f\u6d4f\u89c8\u5668\u53d1\u8d77 http \u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u5728\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u8fd4\u56de\u72b6\u6001\u4e0e\u6570\u636e\uff0c\u5e76\u9644\u5e26\u4ee5\u4e0b headers\uff1a<\/p>\n<pre><code class=\"language-js\">Content-Type: text\/event-stream\nCache-Control: no-cache\nConnection: keep-alive<\/code><\/pre>\n<ul>\n<li>SSE API\u89c4\u5b9a\u63a8\u9001\u4e8b\u4ef6\u6d41\u7684 MIME \u7c7b\u578b\u4e3a <code>text\/event-stream<\/code>\u3002<\/li>\n<li>\u5fc5\u987b\u6307\u5b9a\u6d4f\u89c8\u5668\u4e0d\u7f13\u5b58\u670d\u52a1\u7aef\u53d1\u9001\u7684\u6570\u636e\uff0c\u4ee5\u786e\u4fdd\u6d4f\u89c8\u5668\u53ef\u4ee5\u5b9e\u65f6\u663e\u793a\u670d\u52a1\u7aef\u53d1\u9001\u7684\u6570\u636e\u3002<\/li>\n<li>SSE \u662f\u4e00\u4e2a\u4e00\u76f4\u4fdd\u6301\u5f00\u542f\u7684 TCP \u8fde\u63a5\uff0c\u6240\u4ee5 Connection \u4e3a keep-alive\u3002<\/li>\n<\/ul>\n<h3>3.2 \u6d88\u606f\u683c\u5f0f<\/h3>\n<p>\u200b   EventStream\uff08\u4e8b\u4ef6\u6d41\uff09\u4e3a <code>UTF-8<\/code> \u683c\u5f0f\u7f16\u7801\u7684<code>\u6587\u672c<\/code>\u6216\u4f7f\u7528 Base64 \u7f16\u7801\u548c gzip \u538b\u7f29\u7684\u4e8c\u8fdb\u5236\u6d88\u606f\u3002<\/p>\n<p>\u200b   \u6bcf\u6761\u6d88\u606f\u7531\u4e00\u884c\u6216\u591a\u884c\u5b57\u6bb5\uff08<code>event<\/code>\u3001<code>id<\/code>\u3001<code>retry<\/code>\u3001<code>data<\/code>\uff09\u7ec4\u6210\uff0c\u6bcf\u4e2a\u5b57\u6bb5\u7ec4\u6210\u5f62\u5f0f\u4e3a\uff1a<code>\u5b57\u6bb5\u540d:\u5b57\u6bb5\u503c<\/code>\u3002\u5b57\u6bb5\u4ee5\u884c\u4e3a\u5355\u4f4d\uff0c\u6bcf\u884c\u4e00\u4e2a\uff08\u5373\u4ee5 <code>\\n<\/code> \u7ed3\u5c3e\uff09\u3002\u4ee5<code>\u5192\u53f7<\/code>\u5f00\u5934\u7684\u884c\u4e3a\u6ce8\u91ca\u884c\uff0c\u4f1a\u88ab\u6d4f\u89c8\u5668\u5ffd\u7565\u3002<\/p>\n<p>\u200b   \u6bcf\u6b21\u63a8\u9001\uff0c\u53ef\u7531\u591a\u4e2a\u6d88\u606f\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6d88\u606f\u4e4b\u95f4\u4ee5\u7a7a\u884c\u5206\u9694\uff08\u5373\u6700\u540e\u4e00\u4e2a\u5b57\u6bb5\u4ee5<code>\\n\\n<\/code>\u7ed3\u5c3e\uff09\u3002<\/p>\n<blockquote>\n<p>\ud83d\udce2 \u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u9664\u4e0a\u8ff0\u56db\u4e2a\u5b57\u6bb5\u5916\uff0c\u5176\u4ed6\u6240\u6709\u5b57\u6bb5\u90fd\u4f1a\u88ab\u5ffd\u7565\u3002<\/li>\n<li>\u5982\u679c\u4e00\u884c\u5b57\u6bb5\u4e2d\u4e0d\u5305\u542b\u5192\u53f7\uff0c\u5219\u6574\u884c\u6587\u672c\u5c06\u88ab\u89c6\u4e3a\u5b57\u6bb5\u540d\uff0c\u5b57\u6bb5\u503c\u4e3a\u7a7a\u3002<\/li>\n<li>\u6ce8\u91ca\u884c\u53ef\u4ee5\u7528\u6765\u9632\u6b62\u94fe\u63a5\u8d85\u65f6\uff0c\u670d\u52a1\u7aef\u53ef\u4ee5\u5b9a\u671f\u5411\u6d4f\u89c8\u5668\u53d1\u9001\u4e00\u6761\u6d88\u606f\u6ce8\u91ca\u884c\uff0c\u4ee5\u4fdd\u6301\u8fde\u63a5\u4e0d\u65ad\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<h4>3.2.1 event<\/h4>\n<p>\u200b   \u4e8b\u4ef6\u7c7b\u578b\u3002\u5982\u679c\u6307\u5b9a\u4e86\u8be5\u5b57\u6bb5\uff0c\u5219\u5728\u6d4f\u89c8\u5668\u6536\u5230\u8be5\u6761\u6d88\u606f\u65f6\uff0c\u4f1a\u5728\u5f53\u524d <code>EventSource<\/code> \u5bf9\u8c61\uff08\u89c1 4\uff09\u4e0a\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u4e8b\u4ef6\u7c7b\u578b\u5c31\u662f\u8be5\u5b57\u6bb5\u7684\u5b57\u6bb5\u503c\u3002\u53ef\u4ee5\u4f7f\u7528 <code>addEventListener<\/code> \u65b9\u6cd5\u5728\u5f53\u524d <code>EventSource<\/code> \u5bf9\u8c61\u4e0a\u76d1\u542c\u4efb\u610f\u7c7b\u578b\u7684\u547d\u540d\u4e8b\u4ef6\u3002<\/p>\n<p>\u200b   \u5982\u679c\u8be5\u6761\u6d88\u606f\u6ca1\u6709 <code>event<\/code> \u5b57\u6bb5\uff0c\u5219\u4f1a\u89e6\u53d1 <code>EventSource<\/code> \u5bf9\u8c61 <code>onmessage<\/code> \u5c5e\u6027\u4e0a\u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u3002<\/p>\n<h4>3.2.2 id<\/h4>\n<p>\u200b   \u4e8b\u4ef6ID\u3002\u4e8b\u4ef6\u7684\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u6d4f\u89c8\u5668\u4f1a\u8ddf\u8e2a\u4e8b\u4ef6ID\uff0c\u5982\u679c\u53d1\u751f\u65ad\u8fde\uff0c\u6d4f\u89c8\u5668\u4f1a\u628a\u6536\u5230\u7684\u6700\u540e\u4e00\u4e2a\u4e8b\u4ef6ID\u653e\u5230 HTTP Header <code>Last-Event-Id<\/code> \u4e2d\u8fdb\u884c\u91cd\u8fde\uff0c\u4f5c\u4e3a\u4e00\u79cd\u7b80\u5355\u7684\u540c\u6b65\u673a\u5236\u3002<\/p>\n<p>\u200b   \u4f8b\u5982\u53ef\u4ee5\u5728\u670d\u52a1\u7aef\u5c06\u6bcf\u6b21\u53d1\u9001\u7684\u4e8b\u4ef6ID\u503c\u81ea\u52a8\u52a0 1\uff0c\u5f53\u6d4f\u89c8\u5668\u63a5\u6536\u5230\u8be5\u4e8b\u4ef6ID\u540e\uff0c\u4e0b\u6b21\u4e0e\u670d\u52a1\u7aef\u5efa\u7acb\u8fde\u63a5\u540e\u518d\u8bf7\u6c42\u7684 Header \u4e2d\u5c06\u540c\u65f6\u63d0\u4ea4\u8be5\u4e8b\u4ef6ID\uff0c\u670d\u52a1\u7aef\u68c0\u67e5\u8be5\u4e8b\u4ef6ID\u662f\u5426\u4e3a\u4e0a\u6b21\u53d1\u9001\u7684\u4e8b\u4ef6ID\uff0c\u5982\u679c\u4e0e\u4e0a\u6b21\u53d1\u9001\u7684\u4e8b\u4ef6ID\u4e0d\u4e00\u81f4\u5219\u8bf4\u660e\u6d4f\u89c8\u5668\u5b58\u5728\u4e0e\u670d\u52a1\u5668\u8fde\u63a5\u5931\u8d25\u7684\u60c5\u51b5\uff0c\u672c\u6b21\u9700\u8981\u540c\u65f6\u53d1\u9001\u524d\u51e0\u6b21\u6d4f\u89c8\u5668\u672a\u63a5\u6536\u5230\u7684\u6570\u636e\u3002<\/p>\n<h4>3.2.3 retry<\/h4>\n<p>\u200b   \u91cd\u8fde\u65f6\u95f4\u3002\u6574\u6570\u503c\uff0c\u5355\u4f4d ms\uff0c\u5982\u679c\u4e0e\u670d\u52a1\u5668\u7684\u8fde\u63a5\u4e22\u5931\uff0c\u6d4f\u89c8\u5668\u5c06\u7b49\u5f85\u6307\u5b9a\u65f6\u95f4\uff0c\u7136\u540e\u5c1d\u8bd5\u91cd\u65b0\u8fde\u63a5\u3002\u5982\u679c\u8be5\u5b57\u6bb5\u4e0d\u662f\u6574\u6570\u503c\uff0c\u4f1a\u88ab\u5ffd\u7565\u3002<\/p>\n<p>\u200b   \u5f53\u670d\u52a1\u7aef\u6ca1\u6709\u6307\u5b9a\u6d4f\u89c8\u5668\u7684\u91cd\u8fde\u65f6\u95f4\u65f6\uff0c\u7531\u6d4f\u89c8\u5668\u81ea\u884c\u51b3\u5b9a\u6bcf\u9694\u591a\u4e45\u4e0e\u670d\u52a1\u7aef\u5efa\u7acb\u4e00\u6b21\u8fde\u63a5\uff08\u4e00\u822c\u4e3a 30s\uff09\u3002<\/p>\n<h4>3.2.4 data<\/h4>\n<p>\u200b   \u6d88\u606f\u6570\u636e\u3002\u6570\u636e\u5185\u5bb9\u53ea\u80fd\u4ee5\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u6587\u672c\u5f62\u5f0f\u8fdb\u884c\u53d1\u9001\uff0c\u5982\u679c\u9700\u8981\u53d1\u9001\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u9700\u8981\u5c06\u8be5\u5bf9\u8c61\u4ee5\u4e00\u4e2a JSON \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u8fdb\u884c\u53d1\u9001\u3002\u5728\u6d4f\u89c8\u5668\u63a5\u6536\u5230\u8be5\u5b57\u7b26\u4e32\u540e\uff0c\u518d\u628a\u5b83\u8fd8\u539f\u4e3a\u4e00\u4e2a JSON \u5bf9\u8c61\u3002<\/p>\n<h3>3.3 \u793a\u4f8b<\/h3>\n<p>\u200b   \u5982\u4e0b\u4e8b\u4ef6\u6d41\u793a\u4f8b\uff0c\u5171\u53d1\u9001\u4e86 4 \u6761\u6d88\u606f\uff0c\u6bcf\u6761\u6d88\u606f\u95f4\u4ee5\u4e00\u4e2a\u7a7a\u884c\u4f5c\u4e3a\u5206\u9694\u7b26\u3002<\/p>\n<p>\u200b   \u7b2c\u4e00\u6761\u4ec5\u4ec5\u662f\u4e2a\u6ce8\u91ca\uff0c\u56e0\u4e3a\u5b83\u4ee5\u5192\u53f7\u5f00\u5934\u3002<\/p>\n<p>\u200b   \u7b2c\u4e8c\u6761\u6d88\u606f\u53ea\u5305\u542b\u4e00\u4e2a data \u5b57\u6bb5\uff0c\u503c\u4e3a 'this is second message'\u3002<\/p>\n<p>\u200b   \u7b2c\u4e09\u6761\u6d88\u606f\u5305\u542b\u4e24\u4e2a data \u5b57\u6bb5\uff0c\u5176\u4f1a\u88ab\u89e3\u6790\u4e3a\u4e00\u4e2a\u5b57\u6bb5\uff0c\u503c\u4e3a 'this is third message part 1\\nthis is third message part 2'\u3002<\/p>\n<p>\u200b   \u7b2c\u56db\u6761\u6d88\u606f\u5305\u542b\u5b8c\u6574\u56db\u4e2a\u5b57\u6bb5\uff0c\u6307\u5b9a\u4e86\u4e8b\u4ef6\u7c7b\u578b\u4e3a 'server-time'\uff0c\u4e8b\u4ef6id \u4e3a '1'\uff0c\u91cd\u8fde\u65f6\u95f4\u4e3a '30000'ms\uff0c\u6d88\u606f\u6570\u636e\u4e3a <code>JSON<\/code> \u683c\u5f0f\u7684 '{&quot;text&quot;: &quot;this is fourth message&quot;, &quot;time&quot;: &quot;12:00:00&quot;}'\u3002<\/p>\n<pre><code class=\"language-js\">this is first message\\n\\n\n\ndata: this is second message\\n\\n\n\ndata: this is third message part one\\n\ndata this is third message part two\\n\\n\n\nevent: server-time\\n\nid: 1\nretry: 30000\\n\ndata: {&quot;text&quot;: &quot;this is fourth message&quot;, &quot;time&quot;: &quot;2023-04-09 12:00:00&quot;}\\n\\n<\/code><\/pre>\n<h2>4 \u6d4f\u89c8\u5668 API<\/h2>\n<p>\u200b   \u5728\u6d4f\u89c8\u5668\u7aef\uff0c\u53ef\u4ee5\u4f7f\u7528 JavaScript \u7684 EventSource API \u521b\u5efa <code>EventSource<\/code> \u5bf9\u8c61\u76d1\u542c\u670d\u52a1\u5668\u53d1\u9001\u7684\u4e8b\u4ef6\u3002\u4e00\u65e6\u5efa\u7acb\u8fde\u63a5\uff0c\u670d\u52a1\u5668\u5c31\u53ef\u4ee5\u4f7f\u7528 HTTP \u54cd\u5e94\u7684 'text\/event-stream' \u5185\u5bb9\u7c7b\u578b\u53d1\u9001\u4e8b\u4ef6\u6d88\u606f\uff0c\u6d4f\u89c8\u5668\u5219\u53ef\u4ee5\u901a\u8fc7\u76d1\u542c EventSource \u5bf9\u8c61\u7684 <code>onmessage<\/code>\u3001<code>onopen<\/code> \u548c <code>onerror<\/code> \u4e8b\u4ef6\u6765\u5904\u7406\u8fd9\u4e9b\u6d88\u606f\u3002<\/p>\n<h3>4.1 \u5efa\u7acb\u8fde\u63a5<\/h3>\n<p>\u200b   EventSource \u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1aURL \u548c options\u3002<\/p>\n<p>\u200b   URL \u4e3a http \u4e8b\u4ef6\u6765\u6e90\uff0c\u4e00\u65e6 EventSource \u5bf9\u8c61\u88ab\u521b\u5efa\u540e\uff0c\u6d4f\u89c8\u5668\u7acb\u5373\u5f00\u59cb\u5bf9\u8be5 URL \u5730\u5740\u53d1\u9001\u8fc7\u6765\u7684\u4e8b\u4ef6\u8fdb\u884c\u76d1\u542c\u3002<\/p>\n<p>\u200b   options \u662f\u4e00\u4e2a\u53ef\u9009\u7684\u5bf9\u8c61\uff0c\u5305\u542b withCredentials \u5c5e\u6027\uff0c\u8868\u793a\u662f\u5426\u53d1\u9001\u51ed\u8bc1\uff08cookie\u3001HTTP\u8ba4\u8bc1\u4fe1\u606f\u7b49\uff09\u5230\u670d\u52a1\u7aef\uff0c\u9ed8\u8ba4\u4e3a false\u3002<\/p>\n<pre><code class=\"language-js\">const eventSource = new EventSource(&#039;http_api_url&#039;, { withCredentials: true })<\/code><\/pre>\n<p>\u200b   \u4e0e XMLHttpRequest \u5bf9\u8c61\u7c7b\u578b\uff0cEventSource \u5bf9\u8c61\u6709\u4e00\u4e2a readyState \u5c5e\u6027\u503c\uff0c\u5177\u4f53\u542b\u4e49\u5982\u4e0b\u8868\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>readyState<\/th>\n<th>\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u7aef\u5c1a\u672a\u5efa\u7acb\u8fde\u63a5\u6216\u8fde\u63a5\u5df2\u88ab\u5173\u95ed<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u7aef\u5df2\u6210\u529f\u8fde\u63a5\uff0c\u6d4f\u89c8\u5668\u6b63\u5728\u5904\u7406\u63a5\u6536\u5230\u7684\u4e8b\u4ef6\u53ca\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u7aef\u5efa\u7acb\u8fde\u63a5\u5931\u8d25\uff0c\u5ba2\u6237\u7aef\u4e0d\u518d\u7ee7\u7eed\u5efa\u7acb\u4e0e\u670d\u52a1\u7aef\u4e4b\u95f4\u7684\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u200b   \u53ef\u4ee5\u4f7f\u7528 EventSource \u5bf9\u8c61\u7684 <code>close<\/code> \u65b9\u6cd5\u5173\u95ed\u4e0e\u670d\u52a1\u7aef\u4e4b\u95f4\u7684\u8fde\u63a5\uff0c\u4f7f\u6d4f\u89c8\u5668\u4e0d\u518d\u5efa\u7acb\u4e0e\u670d\u52a1\u7aef\u4e4b\u95f4\u7684\u8fde\u63a5\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u521d\u59cb\u5316 eventSource \u7b49\u7701\u7565\n\n\/\/ \u5173\u95ed\u8fde\u63a5\neventSource.close()<\/code><\/pre>\n<h3>4.2 \u76d1\u542c\u4e8b\u4ef6<\/h3>\n<p>\u200b   EventSource \u5bf9\u8c61\u672c\u8eab\u7ee7\u627f\u81ea EventTarget \u63a5\u53e3\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528 addEventListener() \u65b9\u6cd5\u6765\u76d1\u542c\u4e8b\u4ef6\u3002EventSource \u5bf9\u8c61\u89e6\u53d1\u7684\u4e8b\u4ef6\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u4e09\u79cd\uff1a<\/p>\n<ul>\n<li>open \u4e8b\u4ef6\uff1a\u5f53\u6210\u529f\u8fde\u63a5\u5230\u670d\u52a1\u7aef\u65f6\u89e6\u53d1\u3002<\/li>\n<li>message \u4e8b\u4ef6\uff1a\u5f53\u63a5\u6536\u5230\u670d\u52a1\u5668\u53d1\u9001\u7684\u6d88\u606f\u65f6\u89e6\u53d1\u3002\u8be5\u4e8b\u4ef6\u5bf9\u8c61\u7684 data \u5c5e\u6027\u5305\u542b\u4e86\u670d\u52a1\u5668\u53d1\u9001\u7684\u6d88\u606f\u5185\u5bb9\u3002<\/li>\n<li>error \u4e8b\u4ef6\uff1a\u5f53\u53d1\u751f\u9519\u8bef\u65f6\u89e6\u53d1\u3002\u8be5\u4e8b\u4ef6\u5bf9\u8c61\u7684 event \u5c5e\u6027\u5305\u542b\u4e86\u9519\u8bef\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-js\">\/\/ \u521d\u59cb\u5316 eventSource \u7b49\u7701\u7565\n\neventSource.addEventListener(&#039;open&#039;, function(event) {\n  console.log(&#039;Connection opened&#039;)\n})\n\neventSource.addEventListener(&#039;message&#039;, function(event) {\n  console.log(&#039;Received message: &#039; + event.data);\n})\n\n\/\/ \u76d1\u542c\u81ea\u5b9a\u4e49\u4e8b\u4ef6\neventSource.addEventListener(&#039;xxx&#039;, function(event) {\n  console.log(&#039;Received message: &#039; + event.data);\n})\n\neventSource.addEventListener(&#039;error&#039;, function(event) {\n  console.log(&#039;Error occurred: &#039; + event.event);\n})<\/code><\/pre>\n<p>\u200b   \u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u91c7\u7528\u5c5e\u6027\u76d1\u542c\uff08<code>onopen<\/code>\u3001<code>onmessage<\/code>\u3001<code>onerror<\/code>\uff09\u7684\u5f62\u5f0f\u3002<\/p>\n<pre><code class=\"language-js\">\/\/ \u521d\u59cb\u5316 eventSource \u7b49\u7701\u7565\n\neventSource.onopen = function(event) {\n  console.log(&#039;Connection opened&#039;)\n}\n\neventSource.onmessage = function(event) {\n  console.log(&#039;Received message: &#039; + event.data);\n}\n\neventSource.onerror = function(event) {\n  console.log(&#039;Error occurred: &#039; + event.event);\n})<\/code><\/pre>\n<blockquote>\n<p>\ud83d\udce2\u6ce8\u610f\uff1a<\/p>\n<p><code>EventSource<\/code> \u5bf9\u8c61\u7684\u5c5e\u6027\u76d1\u542c\u53ea\u80fd\u76d1\u542c\u9884\u5b9a\u4e49\u7684\u4e8b\u4ef6\u7c7b\u578b\uff08<code>open<\/code>\u3001<code>message<\/code>\u3001<code>error<\/code>\uff09\u3002\u4e0d\u80fd\u7528\u4e8e\u76d1\u542c\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7c7b\u578b\u3002\u5982\u679c\u8981\u5b9e\u73b0\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7c7b\u578b\u7684\u76d1\u542c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>addEventListener()<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/blockquote>\n<h2>5 \u5b9e\u8df5<\/h2>\n<h3>5.1 \u670d\u52a1\u7aef<\/h3>\n<p>\u200b   \u4f7f\u7528 Node.js \u5b9e\u73b0 SSE \u7684\u7b80\u5355\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-js\">const http = require(&#039;http&#039;)\nconst fs = require(&#039;fs&#039;)\n\nhttp.createServer((req, res) =&gt; {\n  const url = req.url\n  if (url === &#039;\/&#039; || url === &#039;index.html&#039;) {\n    \/\/ \u5982\u679c\u8bf7\u6c42\u6839\u8def\u5f84\uff0c\u8fd4\u56de index.html \u6587\u4ef6\n    fs.readFile(&#039;index.html&#039;, (err, data) =&gt; {\n      if (err) {\n        res.writeHead(500)\n        res.end(&#039;Error loading&#039;)\n      } else {\n        res.writeHead(200, {&#039;Content-Type&#039;: &#039;text\/html&#039;})\n        res.end(data)\n      }\n    })\n  } else if (url.includes(&#039;\/sse&#039;)) {\n    \/\/ \u5982\u679c\u8bf7\u6c42 \/events \u8def\u5f84\uff0c\u5efa\u7acb SSE \u8fde\u63a5\n    res.writeHead(200, {\n      &#039;Content-Type&#039;: &#039;text\/event-stream&#039;,\n      &#039;Cache-Control&#039;: &#039;no-cache&#039;,\n      &#039;Connection&#039;: &#039;keep-alive&#039;,\n      &#039;Access-Control-Allow-Origin&#039;: &#039;*&#039;, \/\/ \u5141\u8bb8\u8de8\u57df\n    })\n\n    \/\/ \u6bcf\u9694 1 \u79d2\u53d1\u9001\u4e00\u6761\u6d88\u606f\n    let id = 0\n    const intervalId = setInterval(() =&gt; {\n      res.write(`event: customEvent\\n`)\n      res.write(`id: ${id}\\n`)\n      res.write(`retry: 30000\\n`)\n      const params = url.split(&#039;?&#039;)[1]\n      const data = { id, time: new Date().toISOString(), params }\n      res.write(`data: ${JSON.stringify(data)}\\n\\n`)\n      id++\n      if (id &gt;= 10) {\n        clearInterval(intervalId)\n        res.end()\n      }\n    }, 1000)\n\n    \/\/ \u5f53\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\u65f6\u505c\u6b62\u53d1\u9001\u6d88\u606f\n    req.on(&#039;close&#039;, () =&gt; {\n      clearInterval(intervalId)\n      id = 0\n      res.end()\n    })\n  } else {\n    \/\/ \u5982\u679c\u8bf7\u6c42\u7684\u8def\u5f84\u65e0\u6548\uff0c\u8fd4\u56de 404 \u72b6\u6001\u7801\n    res.writeHead(404)\n    res.end()\n  }\n}).listen(3000)\n\nconsole.log(&#039;Server listening on port 3000&#039;)<\/code><\/pre>\n<h3>5.2 \u6d4f\u89c8\u5668<\/h3>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;UTF-8&quot;&gt;\n  &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;IE=edge&quot;&gt;\n  &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;\n  &lt;title&gt;SSE Demo&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;h1&gt;SSE Demo&lt;\/h1&gt;\n  &lt;button onclick=&quot;connectSSE()&quot;&gt;\u5efa\u7acb SSE \u8fde\u63a5&lt;\/button&gt;  \n  &lt;button onclick=&quot;closeSSE()&quot;&gt;\u65ad\u5f00 SSE \u8fde\u63a5&lt;\/button&gt;\n  &lt;br \/&gt;\n  &lt;br \/&gt;\n  &lt;div id=&quot;message&quot;&gt;&lt;\/div&gt;\n\n  &lt;script&gt;\n    const messageElement = document.getElementById(&#039;message&#039;)\n\n    let eventSource\n\n    \/\/ \u5efa\u7acb SSE \u8fde\u63a5\n    const connectSSE = () =&gt; {\n      eventSource = new EventSource(&#039;http:\/\/127.0.0.1:3000\/sse?content=xxx&#039;)\n\n      \/\/ \u76d1\u542c\u6d88\u606f\u4e8b\u4ef6\n      eventSource.addEventListener(&#039;customEvent&#039;, (event) =&gt; {\n        const data = JSON.parse(event.data)\n        messageElement.innerHTML += `${data.id} --- ${data.time} --- params\u53c2\u6570\uff1a${JSON.stringify(data.params)}` + &#039;&lt;br \/&gt;&#039;\n      })\n\n      eventSource.onopen = () =&gt; {\n        messageElement.innerHTML += `SSE \u8fde\u63a5\u6210\u529f\uff0c\u72b6\u6001${eventSource.readyState}&lt;br \/&gt;`\n      }\n\n      eventSource.onerror = () =&gt; {\n        messageElement.innerHTML += `SSE \u8fde\u63a5\u9519\u8bef\uff0c\u72b6\u6001${eventSource.readyState}&lt;br \/&gt;`\n      }\n    }\n\n    \/\/ \u65ad\u5f00 SSE \u8fde\u63a5\n    const closeSSE = () =&gt; {\n      eventSource.close()\n      messageElement.innerHTML += `SSE \u8fde\u63a5\u5173\u95ed\uff0c\u72b6\u6001${eventSource.readyState}&lt;br \/&gt;`\n    }\n  &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<p>\u200b   \u5c06\u4e0a\u9762\u7684\u4e24\u4efd\u4ee3\u7801\u4fdd\u5b58\u4e3a <code>server.js<\/code> \u548c <code>index.html<\/code>\uff0c\u5e76\u5728\u547d\u4ee4\u884c\u4e2d\u6267\u884c <code>node server.js<\/code> \u542f\u52a8\u670d\u52a1\u7aef\uff0c\u7136\u540e\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00 <code>http:\/\/localhost:3000<\/code> \u5373\u53ef\u770b\u5230 SSE \u6548\u679c\u3002<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/7002abc7d57a417b86d1ebe49ab1a81atplv-k3u1fbpfcp-zoom-in-crop-mark1512000.gif\" alt=\"7002abc7d57a417b86d1ebe49ab1a81atplv-k3u1fbpfcp-zoom-in-crop-mark1512000\" \/><\/p>\n<h2>6 \u517c\u5bb9\u6027<\/h2>\n<p>\u200b   \u53d1\u5c55\u81f3\u4eca\uff0cSSE \u5df2\u5177\u6709\u5e7f\u6cdb\u7684\u7684\u6d4f\u89c8\u5668<a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fcaniuse.com%2F%3Fsearch%3DServer%20-sent%20events\">\u517c\u5bb9\u6027<\/a>\uff0c\u51e0\u4e4e\u9664 IE \u4e4b\u5916\u7684\u6d4f\u89c8\u5668\u5747\u5df2\u652f\u6301\u3002<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/d707b4d3fa0642beb20337ce9796b6e9tplv-k3u1fbpfcp-zoom-in-crop-mark1512000.gif\" alt=\"d707b4d3fa0642beb20337ce9796b6e9tplv-k3u1fbpfcp-zoom-in-crop-mark1512000\" \/><\/p>\n<p>\u200b   \u5bf9\u4e8e\u4e0d\u652f\u6301 EventSource \u7684\u6d4f\u89c8\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528 <a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fwww.npmjs.com%2Fpackage%2Feventsource\">polyfill<\/a> \u5b9e\u73b0\u3002\u5224\u65ad\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301 EventSource\uff1a<\/p>\n<pre><code class=\"language-js\">if(typeof(EventSource) !== \u201cundefined\u201d) {\n    \/\/ \u652f\u6301\n} else {\n    \/\/ \u4e0d\u652f\u6301\uff0c\u4f7f\u7528 polyfill\n}<\/code><\/pre>\n<h2>7 Fetch \u5b9e\u73b0<\/h2>\n<p>\u200b   \u867d\u7136\u4f7f\u7528 SSE \u6280\u672f\u53ef\u4ee5\u5b9e\u73b0 ChatGPT \u4e00\u6837\u7684\u6253\u5b57\u673a\u6548\u679c\uff0c\u4f46\u662f\u901a\u8fc7\u4e0a\u6587\u8bf7\u6c42 type \u5bf9\u6bd4\u53ef\u4ee5\u53d1\u73b0\uff0c\u5728\u4f7f\u7528 SSE \u65f6\uff0ctype \u4e3a <code>eventSource<\/code>\uff0c\u800c ChatGPT \u4e3a <code>fetch<\/code>\u3002\u4e14\u53d7\u6d4f\u89c8\u5668 EventSource API \u9650\u5236\uff0c\u5728\u4f7f\u7528 SSE \u65f6\u4e0d\u80fd\u81ea\u5b9a\u4e49\u8bf7\u6c42\u5934\u3001\u53ea\u80fd\u53d1\u51fa GET \u8bf7\u6c42\uff0c\u4e14\u5728\u5927\u591a\u6570\u6d4f\u89c8\u5668\u4e2d\uff0cURL \u9650\u5236 <a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F417142\">2000\u4e2a\u5b57\u7b26<\/a>\uff0c\u4e5f\u65e0\u6cd5\u6ee1\u8db3 ChatGPT \u53c2\u6570\u4f20\u9012\u9700\u6c42\u3002<\/p>\n<p>\u200b   \u6b64\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 Fetch API \u5b9e\u73b0\u4e00\u4e2a\u66ff\u4ee3\u63a5\u53e3\uff0c\u7528\u4e8e<strong>\u6a21\u62df<\/strong> SSE \u5b9e\u73b0\u3002\u7b80\u5355\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n<h3>7.1 \u670d\u52a1\u7aef<\/h3>\n<pre><code class=\"language-js\">const http = require(&#039;http&#039;)\nconst fs = require(&#039;fs&#039;)\n\nhttp.createServer((req, res) =&gt; {\n  const url = req.url\n  if (url === &#039;\/&#039; || url === &#039;index-fetch.html&#039;) {\n    \/\/ \u5982\u679c\u8bf7\u6c42\u6839\u8def\u5f84\uff0c\u8fd4\u56de ndex-fetch.html \u6587\u4ef6\n    fs.readFile(&#039;index-fetch.html&#039;, (err, data) =&gt; {\n      if (err) {\n        res.writeHead(500)\n        res.end(&#039;Error loading&#039;)\n      } else {\n        res.writeHead(200, {&#039;Content-Type&#039;: &#039;text\/html&#039;})\n        res.end(data)\n      }\n    })\n  } else if (url.includes(&#039;\/fetch-sse&#039;)) {\n    \/\/ \u5982\u679c\u8bf7\u6c42 \/events-fetch \u8def\u5f84\uff0c\u5efa\u7acb\u8fde\u63a5\n    res.writeHead(200, {\n      &#039;Content-Type&#039;: &#039;text\/event-stream&#039;,\n      &#039;Cache-Control&#039;: &#039;no-cache&#039;,\n      &#039;Connection&#039;: &#039;keep-alive&#039;,\n      &#039;Access-Control-Allow-Origin&#039;: &#039;*&#039;, \/\/ \u5141\u8bb8\u8de8\u57df\n    })\n    let body = &#039;&#039;\n    req.on(&#039;data&#039;, chunk =&gt; {\n      body += chunk\n    })\n\n    \/\/ \u6bcf\u9694 1 \u79d2\u53d1\u9001\u4e00\u6761\u6d88\u606f\n    let id = 0\n    const intervalId = setInterval(() =&gt; {\n      const data = { id, time: new Date().toISOString(), body: JSON.parse(body) }\n      res.write(JSON.stringify(data))\n      id++\n      if (id &gt;= 10) {\n        clearInterval(intervalId)\n        res.end()\n      }\n    }, 1000)\n\n    \/\/ \u5f53\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\u65f6\u505c\u6b62\u53d1\u9001\u6d88\u606f\n    req.on(&#039;close&#039;, () =&gt; {\n      clearInterval(intervalId)\n      id = 0\n      res.end()\n    })\n  } else {\n    \/\/ \u5982\u679c\u8bf7\u6c42\u7684\u8def\u5f84\u65e0\u6548\uff0c\u8fd4\u56de 404 \u72b6\u6001\u7801\n    res.writeHead(404)\n    res.end()\n  }\n}).listen(3001)\n\nconsole.log(&#039;Server listening on port 3001&#039;)<\/code><\/pre>\n<h3>7.2 \u6d4f\u89c8\u5668<\/h3>\n<pre><code class=\"language-html\">&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;UTF-8&quot;&gt;\n  &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;IE=edge&quot;&gt;\n  &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;\n  &lt;title&gt;fetchSSE Demo&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;h1&gt;fetchSSE Demo&lt;\/h1&gt;\n  &lt;button onclick=&quot;connectFetch()&quot;&gt;\u5efa\u7acb fetchSSE \u8fde\u63a5&lt;\/button&gt;\n  &lt;button onclick=&quot;closeSSE()&quot;&gt;\u65ad\u5f00 fetchSSE \u8fde\u63a5&lt;\/button&gt;\n  &lt;br \/&gt;\n  &lt;br \/&gt;\n  &lt;div id=&quot;message&quot;&gt;&lt;\/div&gt;\n\n  &lt;script&gt;\n    const messageElement = document.getElementById(&#039;message&#039;)\n    let controller\n\n    \/\/ \u5efa\u7acb FETCH-SSE \u8fde\u63a5\n    const connectFetch = () =&gt; {\n      controller = new AbortController()\n      fetchEventSource(&#039;http:\/\/127.0.0.1:3001\/fetch-sse&#039;, {\n        method: &#039;POST&#039;,\n        body: JSON.stringify({\n          content: &#039;xxx&#039;\n        }),\n        signal: controller.signal,\n        onopen: () =&gt; {\n          messageElement.innerHTML += `FETCH \u8fde\u63a5\u6210\u529f&lt;br \/&gt;`\n        },\n        onclose: () =&gt; {\n          messageElement.innerHTML += `FETCH \u8fde\u63a5\u5173\u95ed&lt;br \/&gt;`\n        },\n        onmessage: (event) =&gt; {\n          const data = JSON.parse(event)\n          messageElement.innerHTML += `${data.id} --- ${data.time} --- body\u53c2\u6570\uff1a${JSON.stringify(data.body)}` + &#039;&lt;br \/&gt;&#039;\n        },\n        onerror: (e) =&gt; {\n          console.log(e)\n        }\n      })\n    }\n\n    \/\/ \u65ad\u5f00 FETCH-SSE \u8fde\u63a5\n    const closeSSE = () =&gt; {\n      if (controller) {\n        controller.abort()\n        controller = undefined\n        messageElement.innerHTML += `FETCH \u8fde\u63a5\u5173\u95ed&lt;br \/&gt;`\n      }\n    }\n\n    const fetchEventSource = (url, options) =&gt; {\n      fetch(url, options)\n        .then(response =&gt; {\n          if (response.status === 200) {\n            options.onopen &amp;&amp; options.onopen()\n            return response.body\n          }\n        })\n        .then(rb =&gt; {\n          const reader = rb.getReader()\n            const push = () =&gt; {\n              \/\/ done \u4e3a\u6570\u636e\u6d41\u662f\u5426\u63a5\u6536\u5b8c\u6210\uff0cboolean\n              \/\/ value \u4e3a\u8fd4\u56de\u6570\u636e\uff0cUint8Array\n              return reader.read().then(({done, value}) =&gt; {\n                if (done) {\n                  options.onclose &amp;&amp; options.onclose()\n                  return\n                }\n                options.onmessage &amp;&amp; options.onmessage(new TextDecoder().decode(value))\n                \/\/ \u6301\u7eed\u8bfb\u53d6\u6d41\u4fe1\u606f\n                return push()\n              })\n            }\n            \/\/ \u5f00\u59cb\u8bfb\u53d6\u6d41\u4fe1\u606f\n            return push()\n        })\n        .catch((e) =&gt; {\n          options.error &amp;&amp; options.error(e)\n        })\n    }\n&lt;\/script&gt;\n\n&lt;\/html&gt;<\/code><\/pre>\n<blockquote>\n<p>\ud83d\udca1\u4e0d\u540c\u4e8e <code>XMLHttpRequest<\/code>\uff0c<code>fetch<\/code> \u5e76\u672a\u539f\u751f\u63d0\u4f9b\u7ec8\u6b62\u64cd\u4f5c\u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7 DOM API <code>[AbortController](https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/AbortController)<\/code> \u548c <code>AbortSignal<\/code> \u5b9e\u73b0 fetch \u8bf7\u6c42\u7ec8\u6b62\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n<p>\u200b   \u5c06\u4e0a\u9762\u7684\u4e24\u4efd\u4ee3\u7801\u4fdd\u5b58\u4e3a <code>server-fetch.js<\/code> \u548c <code>index-fetch.html<\/code>\uff0c\u5e76\u5728\u547d\u4ee4\u884c\u4e2d\u6267\u884c <code>node server-fetch.js<\/code> \u542f\u52a8\u670d\u52a1\u7aef\uff0c\u7136\u540e\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00 <code>http:\/\/localhost:3001<\/code> \u5373\u53ef\u770b\u5230 fetch \u7248 SSE \u6548\u679c\u3002<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/fe5924bb9317432c90454e5aa0be0f8dtplv-k3u1fbpfcp-zoom-in-crop-mark1512000.gif\" alt=\"fe5924bb9317432c90454e5aa0be0f8dtplv-k3u1fbpfcp-zoom-in-crop-mark1512000\" \/><\/p>\n<h2>8 \u603b\u7ed3<\/h2>\n<p>\u200b   SSE \u6280\u672f\u662f\u4e00\u79cd\u8f7b\u91cf\u7ea7\u7684\u5b9e\u65f6\u901a\u4fe1\u6280\u672f\uff0c\u57fa\u4e8e HTTP \u534f\u8bae\uff0c\u5177\u6709\u670d\u52a1\u7aef\u63a8\u9001\u3001\u65ad\u7ebf\u91cd\u8fde\u3001\u7b80\u5355\u8f7b\u91cf\u7b49\u4f18\u70b9\u3002\u4f46\u662f\uff0cSSE \u6280\u672f\u4e5f\u6709\u4e00\u4e9b\u7f3a\u70b9\uff0c\u5982\u4e0d\u80fd\u8fdb\u884c\u53cc\u5411\u901a\u4fe1\u3001\u8fde\u63a5\u6570\u53d7\u9650\u3001\u4ec5\u652f\u6301 get \u8bf7\u6c42\u7b49\u3002<\/p>\n<p>\u200b   SSE \u53ef\u4ee5\u5728 Web \u5e94\u7528\u7a0b\u5e8f\u4e2d\u5b9e\u73b0\u8bf8\u5982\u80a1\u7968\u5728\u7ebf\u6570\u636e\u3001\u65e5\u5fd7\u63a8\u9001\u3001\u804a\u5929\u5ba4\u5b9e\u65f6\u4eba\u6570\u7b49\u5373\u65f6\u6570\u636e\u63a8\u9001\u529f\u80fd\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cSSE \u5e76\u4e0d\u662f\u9002\u7528\u4e8e\u6240\u6709\u7684\u5b9e\u65f6\u63a8\u9001\u573a\u666f\u3002\u5728\u9700\u8981\u9ad8\u5e76\u53d1\u3001\u9ad8\u541e\u5410\u91cf\u548c\u4f4e\u5ef6\u8fdf\u7684\u573a\u666f\u4e0b\uff0cWebSockets \u53ef\u80fd\u66f4\u52a0\u9002\u5408\u3002\u800c\u5728\u9700\u8981\u66f4\u8f7b\u91cf\u7ea7\u7684\u63a8\u9001\u573a\u666f\u4e0b\uff0cSSE \u53ef\u80fd\u66f4\u52a0\u9002\u5408\u3002\u56e0\u6b64\uff0c\u5728\u9009\u62e9\u5373\u65f6\u66f4\u65b0\u65b9\u6848\u65f6\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u548c\u573a\u666f\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n<p>\u4f5c\u8005\uff1a\u90dd\u6d77\u53cb<br \/>\n\u94fe\u63a5\uff1a<a href=\"https:\/\/juejin.cn\/post\/7221125237500330039\">https:\/\/juejin.cn\/post\/7221125237500330039<\/a><br \/>\n\u6765\u6e90\uff1a\u7a00\u571f\u6398\u91d1<br \/>\n\u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709\u3002\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u83b7\u5f97\u6388\u6743\uff0c\u975e\u5546\u4e1a\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd14\u6982\u8ff0\uff1a \u76f8\u8f83\u4e8e\u7e41\u91cd\u7684 WebSockets\uff0cSSE \u65e0\u7591\u662f H5 \u7b80\u5355\u5373\u65f6\u6570\u636e\u66f4\u65b0\u7684\u8f7b\u91cf\u7ea7\u4ee3\u66ff\u65b9\u6848\u3002 1 \u80cc\u666f \u200b \u5728\u4f7f\u7528 ChatG   \u2026 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[190],"tags":[],"_links":{"self":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8991"}],"collection":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8991"}],"version-history":[{"count":2,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8991\/revisions"}],"predecessor-version":[{"id":8993,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8991\/revisions\/8993"}],"wp:attachment":[{"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8991"},{"taxonomy":"post_tag","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}