将Javascript变量解析为CSS变量 [英] Parse Javascript variable to CSS variables

问题描述

可能重复：

避免在CSS中重复常数

我使用获取视口的宽度和高度来调整我的网站的分辨率。我可以得到这些值与javascript，但我真的不知道从这里去哪里。我想发送的值到我的CSS变量，但我没有找到一个方法来做到这一点很快。可能吗？这是我的JS代码：

I have a javascript file that I am using to obtain the width and height of the viewport to adjust my site's resolution. I can get these values with javascript, but I don't really know where to go from here. I'd like to send the values to my CSS variables but I have not found a way to do this quickly. Is it possible? Here is my JS code:

<script type="text/javascript">
<!--

  var viewportwidth;
  var viewportheight;

 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight

  if (typeof window.innerWidth != 'undefined')
  {
      viewportwidth = window.innerWidth,
      viewportheight = window.innerHeight
  }


 else if (typeof document.documentElement != 'undefined'
 && typeof document.documentElement.clientWidth !=
 'undefined' && document.documentElement.clientWidth != 0)
 {
   viewportwidth = document.documentElement.clientWidth,
   viewportheight = document.documentElement.clientHeight
 }


 else
 {
   viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
   viewportheight = document.getElementsByTagName('body')[0].clientHeight
 }
   document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');
//-->
</script>

对于CSS，我希望能快速，简单但不起作用的东西：

For the CSS I was hoping to get away with something quick and easy but its not working:

@variables{
ViewWidth:'+viewportwidth+';}

@variables{
ViewHeight:'+viewportheight+';}  

html{
max-width: var(ViewWidth);
max-height: var(ViewHeight);}

变量声明中的语法不正确。我写了这样的方式来表明，我试图从JS获取变量值，并将其传递给CSS。

I am assuming that I have the incorrect syntax within the variable declarations. I wrote it that way to show that I am trying to get the variable value from JS and pass it to CSS.

推荐答案

我认为你正在寻找类似这样的东西：

I think you're looking for something similar to this:

var parentElement = document.documentElement || document.body;
parentElement.style.maxWidth = parentElement.clientWidth + 'px';
parentElement.style.maxHeight = parentElement.clientHeight + 'px';

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