获取css规则

var styleSheets = document.styleSheets;
for (var i = 0; i < styleSheets.length; ++i) {
var cssRules = styleSheets[i].cssRules || styleSheets[i].rules;//获取某个style元素中所有规则集
for (var j = 0; j < cssRules.length; ++j) {
var cssRule = cssRules[j];//获取某个规则集
console.info(cssRule.selectorText + " {");//获取该规则集的选择器
for (var k = 0; k < cssRule.style.length; ++k) {
var propertyName = cssRule.style[k];//获取属性名
var propertyValue = cssRule.style[propertyName];//获取属性值
console.info(propertyName + ":" + propertyValue);
}
console.info("}");
}
}