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129 lines
3.1 KiB
Markdown
129 lines
3.1 KiB
Markdown
---
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title: Log 实时日志
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description:
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type: 0
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group: ⚙ 组件
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menuName: Log
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icon:
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order: 56
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---
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用于实时显示日志或程序输出结果。
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## 基本用法
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通过设置 source 来获取日志，支持 ANSI 基本颜色显示。
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```json
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{
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"type": "log",
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"height": 300,
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"source": "http://localhost:3000/"
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}
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```
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由于缺少线上服务，所以这个例子无法在线演，它的运行效果如下图所示
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### 后端实现参考
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后端需要通过流的方式输出结果，比如 Node 实现示例：
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```javascript
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const http = require('http');
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let app = http.createServer((req, res) => {
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res.writeHead(200, {
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'Content-Type': 'text/plain',
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'Access-Control-Allow-Origin': '*'
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});
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let index = 1;
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let timer = setInterval(() => {
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if (index < 50) {
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// 每次 write 都会立刻传给前端
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res.write(`line: ${index}\n`);
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index += 1;
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} else {
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res.end('end');
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clearInterval(timer);
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}
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}, 100);
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});
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app.listen(3000, '127.0.0.1');
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console.log('Node server running on port 3000');
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```
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其它语言请查找如何使用 stream 的方式返回内容，比如 Spring 的 `StreamingResponseBody`：
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```java
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@Controller
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public class StreamingResponseBodyController {
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@GetMapping("/logs")
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public ResponseEntity<StreamingResponseBody> handleLog() {
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StreamingResponseBody stream = out -> {
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for (int i = 0; i < 1000; i++) {
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String msg = "log" + " @ " + new Date();
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out.write(msg.getBytes());
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out.flush();
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}
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out.close();
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};
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return new ResponseEntity(stream, HttpStatus.OK);
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}
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}
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```
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需要注意有些反向代理有 buffer 设置，比如 nginx 的 [proxy_buffer_size](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size)，它会使得即便后端返回内容也需要等 buffer 满了才会真正返回前端，如果需要更实时的效果就需要关掉此功能。
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## 自动滚动到底部
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通过 `autoScroll` 可以关闭此功能
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## source 支持变量
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> 1.4.2 及以上版本
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可以初始设置为空，这样初始不会加载，而等这个变量有值的时候再加载
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```json
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{
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"type": "form",
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"body": [
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{
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"label": "数据源",
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"type": "select",
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"name": "source",
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"options": [
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{
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"label": "A",
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"value": "http://localhost:3000/"
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},
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{
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"label": "B",
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"value": "http://localhost:4000/"
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}
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]
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},
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{
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"type": "log",
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"height": 300,
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"placeholder": "请点击上面的数据源",
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"source": "${source | raw}"
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}
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]
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}
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```
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## 属性表
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| 属性名 | 类型 | 默认值 | 说明 |
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| ----------- | --------- | ------ | ------------------ |
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| height | `number` | 500 | 展示区域高度 |
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| className | `string` | | 外层 CSS 类名 |
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| autoScroll | `boolean` | true | 是否自动滚动 |
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| placeholder | `string` | | 加载中的文字 |
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| encoding | `string` | utf-8 | 返回内容的字符编码 |
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