HTML、CSS及JavaScript ： JavaScript征服Style的五种武器_html/css_WEB-ITnose
在HTML的世界里，对于一个元素来说，看的主要不是气质，而是它的Style，因为Style决定了颜值。俗话说，JavaScript与Style，得其一者得天下。但是，Style永远无法改变JavaScript，JavaScript却可以征服Style。因为JavaScript有五种武器，所以可以对Style为所欲为，既可远观，亦可亵玩。
第一种武器是 className，在JavaScript，得到一个元素的 className就是得到了这个元素的 class属性的值。Show Code：
<div id="box" class="one two"/><script> var box = document.getElementById("box") alert(box.className) box.className += ' three'</script>上面的代码拿到 box的 class，然后又给它添加了一个 three。如果想去掉某个 class，只要通过字符串操作去掉，然后重新给 className赋值就可以了。
第二种武器是 style，确切地说，这是个武器包，你几乎可以用它修改所有 style。比如说你执行了 box.style.width='100px'，就相当于在 box上添加了一个 style="width:100px"。
对于那些由多个单词组成的style值，就是 background-color、 marigin-top之类的，要把横线去掉，然后单词的首字母大写。对，改成像 backgroundColor、 mariginTop这样。像 -moz-border-radius这种，也是把 -去掉，然后后面的字母换成大写，就是改成 MozBorderRadius。
因为style属性优先与css，所以你可以用style覆盖掉css中设置的样式，也可以把它设成空字符串还原：
var box = document.getElementById("box")box.style.width='100px'box.style.width=''上面的代码最终会保持box的 width不变。
第三种武器是 cssText，好吧，实际上它也是style中的一个属性。但因为它很强大，所以我们特意提高了它的地位。用 style.cssText可以获取和设置完整的style内容。
<div>Button</div><script> var div = document.body.children[0] div.style.cssText='color: red !important; \ background-color: yellow; \ width: 100px; \ text-align: center; \ blabla: 5; \ ' alert(div.style.cssText)</script>
浏览器会对 cssText进行解析，然后把解析结果应用到元素上去。上面代码中那个不认识blabla就直接忽略掉了，不会报错，所以要注意typo。
并且如果你想加 !important，只能用 cssText。
接下来要出场的，是真正重量级的两种武器，或者说一又十分之一种武器。一种是标准的 getComputedStyle，另外一种是它的十分之一变种，自恋的M$IE专为自己打造的 currentStyle（哦，据说它的市场份额只有十分之一了嘛）。
在真实的页面中，我们很少见到在元素的 style属性中设置的样式，所以用 style几乎读取不到任何元素的Style。比如下面这个例子：
<style> body { margin: 10px }</style><body> <script> alert(document.body.style.marginTop) </script> </body>是得不到任何值的。
这种需求只能靠 window.getComputedStyle来解决，这个方法是 DOM Level 2的标准方法，所有浏览器（除了IE < 9）都支持。
所以要获取上面那个例子中的marginTop，以及所有在浏览器给元素应用了style和样式表之后的Style，都可以像下面这样：
<style> body { margin: 10px }</style><body> <script> var computedStyle = getComputedStyle(document.body, null) alert(computedStyle.marginTop) </script></body>至于IE 9之前的浏览器，就得用 currentStyle读取了。或者像这样：
<style> body { margin: 10% }</style><body><script> if (window.getComputedStyle) { var computedStyle = getComputedStyle(document.body, null) } else { computedStyle = document.body.currentStyle } alert(computedStyle.marginTop) </script></body>好了，上面就是JavaScript征服Style的五种武器。不过我是只用前面四种武器的，既然用户到现在还用IE
声明：本文参考(抄袭)了 Styles and classes, getComputedStyle
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