DOMPointInit.y | Web API

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DOMPointInit dictionary's y property is used to specify the y -coordinate of a point in 2D or 3D space when either creating or serializing to JSON a DOMPoint or DOMPointReadOnly 对象。

In general, the value of y increases to the right and decreases to the left, becoming negative to the left of the origin. This may change if transforms have been applied causing the axes' orientation to change.

句法

var DOMPointInit = {
  y: yPos
};
DOMPointInit.y = yPos;
var yPos = DOMPointInit.y;

值

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

If this property is missing when the DOMPointInit object is passed into fromPoint() , the value is assumed to be 0 by default.

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() .

规范

规范	状态	注释
Geometry Interfaces Module Level 1 The definition of 'y' 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
`y`	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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实验。期望将来行为有所改变。

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最后修改： Mar 18, 2019

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