XMLDocument.async

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非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

弃用
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

document.async can be set to indicate whether a XMLDocument.load() call should be an asynchronous or synchronous request. true is the default value, indicating that documents should be loaded asynchronously.

(It has been possible to load documents synchronously since 1.4 alpha.)

范例

function loadXMLData(e) {
  alert(new XMLSerializer().serializeToString(e.target)); // Gives querydata.xml contents as string
}
var xmlDoc = document.implementation.createDocument("", "test", null);
xmlDoc.async = false;
xmlDoc.onload = loadXMLData;
xmlDoc.load('querydata.xml');

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
`async` 弃用非标	Chrome No	Edge No	Firefox 1 — 68 不支持 1 — 68 见 bug 1328138 for removal.	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 4 — 68 不支持 4 — 68 见 bug 1328138 for removal.	Opera Android No	Safari iOS No	Samsung Internet Android No

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