DOMPointInit.w | Web API

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DOMPointInit dictionary's w property is used to specify the w perspective value of a point in space when either creating or serializing to JSON a DOMPoint or DOMPointReadOnly 对象。

句法

var DOMPointInit = {
  w: wPerspective
};
DOMPointInit.w = wPerspective;
var wPerspective = DOMPointInit.w;

值

A double-precision floating-point value indicating the point's w perspective value. This value is unrestricted , meaning that it is allowed to be infinite or invalid (that is, its value may be NaN or ±Infinity ).

There are two methods which use DOMPointInit :

The static function DOMPointReadOnly.fromPoint() takes an object that complies with DOMPointInit as its sole input parameter, to specify the coordinates and perspective value of the new point to be created. This method is, by inheritance, also available as DOMPoint.fromPoint() .
DOMPointReadOnly.toJSON() 方法返回 DOMPointInit object that describes the same point as the original point. By inheritance, this method is also available as DOMPoint.toJSON() .

This value is assumed to be 1 by default if not included in the DOMPointInit object passed into fromPoint() .

规范

规范	状态	注释
Geometry Interfaces Module Level 1 The definition of 'w' in that specification.	候选推荐	初始定义

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
`w`	Chrome ?	Edge ?	Firefox 62	IE No	Opera ?	Safari No	WebView Android ?	Chrome Android ?	Firefox Android 62	Opera Android ?	Safari iOS No	Samsung Internet Android ?

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完整支持
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兼容性未知 ?
实验。期望将来行为有所改变。

元数据

最后修改： Mar 18, 2019

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