javascript - Firefox 会默默忽略一些不非法的 CSS 值

Question

我想通过 document.styleSheets 获取样式表，但是，Firefox 似乎会默默地忽略一些不非法的 CSS 值。我现在正在使用vh & vw，我想获取 css 值并为其生成正确的 px 。

有什么方法可以让 Firefox 忽略这些值？

Answer 1

我确实认为 Firefox（可能还有其他浏览器）只会从样式表中返回计算出的样式。

但是，您可以通过选择所需的标签进入更手动的过程，发出 ajax 请求以获取其文本内容（几乎是即时的，因为它在缓存中），然后解析它。

html:

<link rel="stylesheet" href="style.css" id="css">

js（使用 jQuery）：

$.get($("#css").attr("href"), function(data) //requests the css in ajax
{
   var selector = "div#right", rules = {};

   data = data.substring(data.indexOf(selector)); //trim all that is before your selector
   data = data.substring(data.indexOf("{") + 1, data.indexOf("}")); //get only what's in the curly braces
   data = data.split(";"); //split to get an array with each cell is a css rule

   for (var i = 0, l = data.length; i < l; i++) //loop through
   {
        data[i] = data[i].replace(/^\s+/, ''); //trim spaces before
        data[i] = data[i].replace(/\s+$/, ''); //trim spaces after

        if (data[i].indexOf(':') == -1) { continue; } //if rule is invalid, skip it

        data[i] = data[i].split(':'); //split rule so you have a sub-array with 0:key and 1:value
        rules[data[i][0]] = data[i][1]; //apply it to an object
   }

   console.dir(rules); //here you have. if your rules have "-" in it, you can't access with directly, but with brackets it'll be ok. ie : rules.margin-left is wrong but you can with rules["margin-left"].

}, "text");