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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest/abort below:

XMLHttpRequest.abort() - Web API | MDN

XMLHttpRequest.abort()

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如果该请求已被发出,XMLHttpRequest.abort() 方法将终止该请求。当一个请求被终止,它的 readyState 将被置为 XMLHttpRequest.UNSENT (0),并且请求的 status 置为 0。

语法 参数

无。

返回值

undefined

示例
var xhr = new XMLHttpRequest(),
  method = "GET",
  url = "https://developer.mozilla.org/";
xhr.open(method, url, true);

xhr.send();

if (OH_NOES_WE_NEED_TO_CANCEL_RIGHT_NOW_OR_ELSE) {
  xhr.abort();
}
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