progress

概述

HTML中的progress (<progress>) 元素用来显示一项任务的完成进度.虽然规范中没有规定该元素具体如何显示,浏览器开发商可以自己决定,但通常情况下,该元素都显示为一个进度条形式.

使用上下文

允许内容	Phrasing content
是否可以省略标签	不可以,起始标签和结束标签都是必须的.
有效的父元素	Phrasing content, 但不能包含其他的`progress后代元素`.
规范文档	HTML5, section 4.10.16

属性

和其他的HTML元素一样,该元素具有全局属性.

max: 该属性描述了这个progress元素所表示的任务一共需要完成多少工作.
value: 该属性用来指定该进度条已完成的工作量.如果没有value属性,则该进度条的进度为"不确定",也就是说,进度条不会显示任何进度,你无法估计当前的工作会在何时完成(比如在下载一个未知大小的文件时,下载对话框中的进度条就是这样的).

你可以使用orient属性来指定该进度条的显示方向是横向(默认)还是纵向.CSS伪类:indeterminate可以用来匹配那些不确定的进度条.

DOM 接口

该元素实现了HTMLProgressElement接口.

例子

<progress value="70" max="100">70 %</progress>

结果

查看在线演示

在Mac OS X上,显示的进度条如下:

在Windows上,显示的进度条如下:

附加示例

查看 orient.

浏览器兼容性

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`progress`	Chrome Full support 6	Edge Full support Yes	Firefox Full support 6 Notes Full support 6 Notes Notes Prior to Firefox 14, the `<progress>` element was incorrectly classified as a form element, and therefore had a `form` attribute. This has been fixed. Notes Firefox provides the `::-moz-progress-bar` pseudo-element, which lets you style the part of the interior of the progress bar representing the amount of work completed so far.	IE Full support 10	Opera Full support 11	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6 Notes Full support 6 Notes Notes Prior to Firefox 14, the `<progress>` element was incorrectly classified as a form element, and therefore had a `form` attribute. This has been fixed. Notes Firefox provides the `::-moz-progress-bar` pseudo-element, which lets you style the part of the interior of the progress bar representing the amount of work completed so far.	Opera Android Full support 11	Safari iOS Full support 7 Notes Full support 7 Notes Notes Safari on iOS does not support indeterminate progress bars (they are rendered like 0%-completed progress bars).	Samsung Internet Android Full support Yes
`max`	Chrome Full support 6	Edge Full support Yes	Firefox Full support 6	IE Full support 10	Opera Full support 11	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6	Opera Android Full support 11	Safari iOS Full support 7	Samsung Internet Android Full support Yes
`value`	Chrome Full support 6	Edge Full support Yes	Firefox Full support 6	IE Full support 10	Opera Full support 11	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6	Opera Android Full support 11	Safari iOS Full support 7	Samsung Internet Android Full support Yes

Legend

Full support: Full support
See implementation notes.: See implementation notes.