ProgressEvent()

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ProgressEvent() constructor returns a newly created ProgressEvent , representing the current completion of a long process.

progressEvent = new ProgressEvent(type, {lengthComputable: aBooleanValue, loaded: aNumber, total: aNumber});

ProgressEvent() constructor also inherits arguments from Event() .

type: 是 DOMString representing the name of the type of the ProgressEvent . It is case-sensitive.
lengthComputable 可选: 是 布尔 flag indicating if the total work to be done, and the amount of work already done, by the underlying process is calculable. In other words, it tells if the progress is measurable or not. It defaults to false .
loaded 可选: 是 unsigned long long representing the amount of work already performed by the underlying process. The ratio of work done can be calculated with the property and ProgressEvent.total . When downloading a resource using HTTP, this only represent the part of the content itself, not headers and other overhead. It defaults to 0 .
total 可选: 是 unsigned long long representing the total amount of work that the underlying process is in the progress of performing. When downloading a resource using HTTP, this only represent the content itself, not headers and other overhead. It defaults to 0 .

规范	状态	注释
XMLHttpRequest The definition of 'ProgressEvent()' in that specification.	实时标准

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
`ProgressEvent()` 构造函数	Chrome Yes	Edge ≤79	Firefox 22	IE No	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 22	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes