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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title></head>
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<body>
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<ul id="ul"></ul>
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</body>
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<script>
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//生成li元素
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function createLi(data) {
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let li = document.createElement("li");
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li.innerHTML = String(data.message);
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return li;
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}
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//判断当前浏览器是否支持SSE
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let source = ''
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if (!!window.EventSource) {
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source = new EventSource('http://127.0.0.1:3000/sse/ai/question/push?title=请你介绍一下SSE？');
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if (source.readyState === 0) {
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//sseObj.readyState === EventSource.CONNECTING 也可以判断正在连接服务器
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console.log('0:"正在连接服务器...');
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}
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} else {
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throw new Error("当前浏览器不支持SSE")
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}
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//对于建立链接的监听
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source.onopen = function (event) {
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console.log(source.readyState);
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console.log("长连接打开");
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if (source.readyState === 1) {
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// sseObj.readyState === EventSource.OPEN 也可以判断连接成功
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let data = `SSE 连接成功，状态${source.readyState}, 对象${event}`;
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console.log(data);
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console.log("1:SSE 连接成功");
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}
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};
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//对服务端消息的监听
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source.onmessage =
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function (event) {
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console.log(JSON.parse(event.data));
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console.log("收到长连接信息");
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let li = createLi(JSON.parse(event.data));
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document.getElementById("ul").appendChild(li)
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};
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// 接收消息，这个事件需要和后端保持一致哈
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// 后端的事件名称：sseEvent
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// source.addEventListener("sseEvent", function (event) {
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// const data = JSON.parse(event.data);
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// //如果最后推送的是 'contDnd',说明推送已经完了。此时关闭连接
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// if (data.content === 'contDnd') {
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// source.close();
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// if (source.readyState === 2) {
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// // sseObj.readyState === EventSource.CLOSED 也可以判断连接已经关闭
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// console.log('2连接已经关闭。', source.readyState);
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// }
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// console.log("end");
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// } else {
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// let li = createLi(JSON.parse(data.content));
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// document.getElementById("ul").appendChild(li)
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// }
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// console.log("这次消息推送的内容event:", data.content);
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// });
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//对断开链接的监听
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source.onerror = function (event) {
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console.log(source.readyState);
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console.log("长连接中断");
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};
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</script>
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</html> |