今天学习《javascript高级程序设计》的时候知道了一个小小的知识点。。发现自己原来是这么的菜呀。。。
做一个demo的时候,发现写在html标签里用style属性的样式<h1 style="width:100px;">,可以用普通的DOM方法获得。例如theEl.style.width,但是如果是写在style标签下的样式<type="text/css">h1{width:100px;}</style>,这种方法就会输出空值。
这个时候必须用到cssRules集合才能取得、修改该样式的值。
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注意:样式集合在IE和FF下的名称是不一样的,FF下是document.styleSheets[0].cssRules
ie下是document.styleSheets[0].rules