在JavaScript中将宽度和高度设置为百分比 [英] Setting width and height as a percentage in JavaScript

问题描述

这是我的JavaScript代码:

Here is my JavaScript code:

a.width = a.width ? a.width : 640;
a.height = a.height ? a.height : 360;

如何设置640px和360px的百分比呢?我希望它们都是窗口大小的70％.

How can I make the 640px and 360px percentages instead? I want them both to be 70% of the windows size.

推荐答案

百分比是相对的值.

您需要具有如screenWidth之类的相对值(假设为) 1240px ，这样您就可以获得该值的百分比.

you need to have relative value like screenWidth (for suppose) 1240px so that you will get percentage of that value.

示例

var pixels = 100;
var screenWidth = window.screen.width;
var percentage = ( screenWidth - pixels ) / screenWidth ; // 0.92%

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