Document：readystatechange 事件

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

当文档的 readyState 属性发生改变时，会触发 readystatechange 事件。

是否冒泡 否
是否可取消 否
接口 Event
Event handler 属性 onreadystatechange

示例

实时演示

HTML

html
<div class="controls">
  <button id="reload" type="button">Reload</button>
</div>

<div class="event-log">
  <label>Event log:</label>
  <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea>
</div>

JavaScript

js
const log = document.querySelector(".event-log-contents");
const reload = document.querySelector("#reload");

reload.addEventListener("click", () => {
  log.textContent = "";
  window.setTimeout(() => {
    window.location.reload(true);
  }, 200);
});

window.addEventListener("load", (event) => {
  log.textContent = log.textContent + "load\n";
});

document.addEventListener("readystatechange", (event) => {
  log.textContent = log.textContent + `readystate: ${document.readyState}\n`;
});

document.addEventListener("DOMContentLoaded", (event) => {
  log.textContent = log.textContent + `DOMContentLoaded\n`;
});

结果

规范

Specification
HTML Standard
# event-readystatechange

浏览器兼容性

BCD tables only load in the browser

参见