Document.readyState

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句法
范例
规范
浏览器兼容性
另请参阅
相关话题

Document.readyState 特性描述加载状态为 document .

当此特性的值改变时， readystatechange 事件激发在 document 对象。

句法

var string = document.readyState;

值

readyState 在文档可以是以下之一：

loading: document 仍在加载中。
interactive
complete: 文档和所有子资源已完成加载。状态指示 load 事件即将激发。

范例

不同的准备就绪状态

switch (document.readyState) {
  case "loading":
    // The document is still loading.
    break;
  case "interactive":
    // The document has finished loading. We can now access the DOM elements.
    // But sub-resources such as images, stylesheets and frames are still loading.
    var span = document.createElement("span");
    span.textContent = "A <span> element.";
    document.body.appendChild(span);
    break;
  case "complete":
    // The page is fully loaded.
    console.log("The first CSS rule is: " + document.styleSheets[0].cssRules[0].cssText);
    break;
}

readystatechange 作为 DOMContentLoaded 事件的替代

// Alternative to DOMContentLoaded event
document.onreadystatechange = function () {
  if (document.readyState === 'interactive') {
    initApplication();
  }
}

readystatechange 作为加载事件的替代

// Alternative to load event
document.onreadystatechange = function () {
  if (document.readyState === 'complete') {
    initApplication();
  }
}

readystatechange 作为事件监听器在 DOMContentLoaded 之前插入或修改 DOM

document.addEventListener('readystatechange', event => {
  if (event.target.readyState === 'interactive') {
    initLoader();
  }
  else if (event.target.readyState === 'complete') {
    initApp();
  }
});

规范

规范	状态	注释
HTML 实时标准在该规范中的 Document readiness 定义。	实时标准
HTML 5.1 在该规范中的 Document readiness 定义。	推荐
HTML5 在该规范中的 Document readiness 定义。	推荐	最初的规范。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`readyState`	Chrome 1	Edge 12	Firefox 4	IE 11 11 9 — 11 注意事项 Internet Explorer 9 and 10 have bugs where the 'interactive' state can be fired too early before the document has finished parsing. 8 — 9 注意事项 Only supports 'complete'.	Opera 11 注意事项 11 注意事项 Opera Presto fires 'complete' late after the 'load' event (in an incorrect order as per HTML5 standard specification).	Safari 1	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 11 注意事项 11 注意事项 Opera Presto fires 'complete' late after the 'load' event (in an incorrect order as per HTML5 standard specification).	Safari iOS 1	Samsung Internet Android 1.0

图例

完整支持

另请参阅

readystatechange event
DOMContentLoaded event
load event

元数据

最后修改： Mar 18, 2019

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句法

值

范例