JavaScript动态添加CSS

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function addCssByStyle(cssString){var doc=document;var style=doc.createElement("style");style.setAttribute("type", "text/css");if(style.styleSheet){// IEstyle.styleSheet.cssText = cssString;} else {// w3cvar cssText = doc.createTextNode(cssString);style.appendChild(cssText);}var heads = doc.getElementsByTagName("head");if(heads.length)heads[0].appendChild(style);elsedoc.documentElement.appendChild(style);}