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3 | 3 | <head>
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4 | 4 | <meta charset="UTF-8">
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5 | 5 | <meta name="viewport" content="width=device-width, initial-scale=1.0">
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6 |
| - <title>SSE Example</title> |
| 6 | + <title>EventStream Example</title> |
7 | 7 | <script>
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8 | 8 | let eventSource = null; // 用于存储 EventSource 实例
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| 9 | + let messageQueue = []; // 消息队列 |
| 10 | + let isTyping = false; // 当前是否有消息正在输出 |
| 11 | + let scrollTimeout = null; // 用于节流的定时器 |
| 12 | + |
| 13 | + // 节流的 scrollToBottom 函数 |
| 14 | + function scrollToBottom() { |
| 15 | + if (scrollTimeout) return; // 如果已经有一个定时器在运行,则不重复设置 |
| 16 | + scrollTimeout = setTimeout(() => { |
| 17 | + const messageBox = document.getElementById("message-box"); |
| 18 | + messageBox.scrollTop = messageBox.scrollHeight; // 滚动到底部 |
| 19 | + scrollTimeout = null; // 清除定时器标记 |
| 20 | + }, 100); // 节流间隔(毫秒) |
| 21 | + } |
| 22 | + |
| 23 | + // 打字机效果函数 |
| 24 | + function typeText(container, text, delay = 50) { |
| 25 | + return new Promise((resolve) => { |
| 26 | + let index = 0; |
| 27 | + |
| 28 | + function type() { |
| 29 | + if (index < text.length) { |
| 30 | + container.textContent += text[index]; |
| 31 | + index++; |
| 32 | + |
| 33 | + // 滚动到底部,使用节流优化 |
| 34 | + scrollToBottom(); |
| 35 | + |
| 36 | + setTimeout(type, delay); |
| 37 | + } else { |
| 38 | + resolve(); |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + type(); |
| 43 | + }); |
| 44 | + } |
| 45 | + |
| 46 | + async function processQueue() { |
| 47 | + if (isTyping || messageQueue.length === 0) return; |
| 48 | + |
| 49 | + isTyping = true; // 设置正在输出状态 |
| 50 | + |
| 51 | + const { container, text } = messageQueue.shift(); // 取出队列中的第一个任务 |
| 52 | + await typeText(container, text); // 执行打字效果 |
| 53 | + |
| 54 | + isTyping = false; // 结束输出状态 |
| 55 | + await processQueue(); // 继续处理队列中的下一个任务 |
| 56 | + } |
9 | 57 |
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10 | 58 | function startEventStream() {
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11 |
| - // 防止重复连接 |
12 | 59 | if (eventSource) {
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13 |
| - logMessage("已经连接到事件流,请勿重复点击!"); |
| 60 | + processMessage("已经连接到事件流,请勿重复点击!"); |
14 | 61 | return;
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15 | 62 | }
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16 | 63 |
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17 |
| - // 创建 EventSource 实例并连接到后端 SSE 接口 |
18 | 64 | eventSource = new EventSource('/eventStream');
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19 | 65 |
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20 |
| - // 监听消息事件 |
21 | 66 | eventSource.onmessage = (event) => {
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22 |
| - logMessage(`收到消息: ${event.data}`); |
| 67 | + if (event.data === "END") { |
| 68 | + processMessage("服务器已发送所有消息,流结束。"); |
| 69 | + stopEventStream(); // 手动停止事件流 |
| 70 | + } else { |
| 71 | + processMessage(`收到消息: ${event.data}`); |
| 72 | + } |
23 | 73 | };
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24 | 74 |
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25 |
| - // 监听连接打开事件 |
26 | 75 | eventSource.onopen = () => {
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27 |
| - logMessage("连接已建立,开始接收数据..."); |
| 76 | + processMessage("连接已建立,开始接收数据..."); |
28 | 77 | };
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29 | 78 |
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30 |
| - // 监听错误事件 |
31 | 79 | eventSource.onerror = () => {
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32 |
| - logMessage("发生错误或连接已关闭!"); |
33 |
| - stopEventStream(); // 停止事件流 |
| 80 | + processMessage("发生错误或连接已关闭!"); |
| 81 | + stopEventStream(); |
34 | 82 | };
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35 | 83 | }
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36 | 84 |
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37 | 85 | function stopEventStream() {
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38 | 86 | if (eventSource) {
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39 |
| - eventSource.close(); // 关闭连接 |
| 87 | + eventSource.close(); |
40 | 88 | eventSource = null;
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41 |
| - logMessage("事件流已停止。"); |
| 89 | + processMessage("事件流已停止。"); |
42 | 90 | }
|
43 | 91 | }
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44 | 92 |
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45 |
| - function logMessage(message) { |
46 |
| - const logBox = document.getElementById("log-box"); |
| 93 | + function processMessage(message) { |
| 94 | + const messageBox = document.getElementById("message-box"); |
47 | 95 | const messageElement = document.createElement("div");
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48 |
| - messageElement.textContent = message; |
49 |
| - logBox.appendChild(messageElement); |
50 |
| - logBox.scrollTop = logBox.scrollHeight; // 自动滚动到底部 |
| 96 | + messageBox.appendChild(messageElement); |
| 97 | + |
| 98 | + // 将任务添加到队列中 |
| 99 | + messageQueue.push({ container: messageElement, text: message }); |
| 100 | + processQueue(); |
51 | 101 | }
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52 | 102 | </script>
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53 | 103 | <style>
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56 | 106 | margin: 20px;
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57 | 107 | }
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58 | 108 |
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59 |
| - #log-box { |
60 |
| - width: 100%; |
| 109 | + #message-box { |
| 110 | + width: 95%; |
61 | 111 | height: 300px;
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62 | 112 | border: 1px solid #ccc;
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63 | 113 | padding: 10px;
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64 |
| - overflow-y: scroll; |
| 114 | + overflow-y: auto; |
65 | 115 | background-color: #f9f9f9;
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| 116 | + margin-top: 10px; |
66 | 117 | }
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67 | 118 |
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68 | 119 | .button-container {
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|
87 | 138 | </style>
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88 | 139 | </head>
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89 | 140 | <body>
|
90 |
| -<h1>Server-Sent Events (SSE) 示例</h1> |
| 141 | +<h1>EventStream 示例</h1> |
91 | 142 | <p>点击“开始”按钮连接到后端事件流接口,并查看接收到的消息:</p>
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92 |
| - |
93 |
| -<div id="log-box"></div> |
94 |
| - |
95 | 143 | <div class="button-container">
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96 | 144 | <button onclick="startEventStream()">开始接收</button>
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97 | 145 | <button onclick="stopEventStream()">停止接收</button>
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98 | 146 | </div>
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| 147 | +<div id="message-box"></div> |
99 | 148 | </body>
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100 | 149 | </html>
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