摘要：
1.用document.styleSheets获得通过style标签和link标签加入的样式返回类型var styleSheetList=document.styleSheets;//object StyleSheetListvar styleSheet=document.styleSheets[i];//object CSSStyleSheetvar cssRuleList=document.styleSheets[i].cssRules;//object CSSRuleListvar cssRule=document.styleSheets[i].cssRules[j];//object 阅读全文
