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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

XMLHttpRequestEventTarget.onprogress is the function called periodically with information when an XMLHttpRequest before success completely.

句法

XMLHttpRequest.onprogress = callback;
					

值

• callback is the function to be called periodically before the request is completed.

事件

• event.loaded the amount of data currently transfered.
• event.total the total amount of data to be transferred.

XMLHttpRequest.onprogress = function (event) {
  event.loaded;
  event.total;
};
					

范例

var xmlhttp = new XMLHttpRequest(),
  method = 'GET',
  url = 'https://developer.mozilla.org/';
xmlhttp.open(method, url, true);
xmlhttp.onprogress = function () {
  //do something
};
xmlhttp.send();
					

规范

规范	状态	注释
XMLHttpRequest	实时标准	WHATWG (Web 超文本应用程序技术工作组) 实时标准

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
onprogress	Chrome Yes	Edge ≤18	Firefox Yes	IE 10	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

完整支持

元数据

• 最后修改： Jul 31, 2020

相关话题

1. XMLHttpRequestEventTarget
2. 特性

   1. onabort
   2. onerror
   3. onload
   4. onloadstart
   5. onprogress
3. 继承：

   1. EventTarget
4. XMLHttpRequest 相关页面

   1. FormData
   2. XMLHttpRequest
   3. XMLHttpRequestUpload