Document:readystatechange 事件

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

是否冒泡
是否可取消
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