function editCSSRule(selector,styles,url,media){
var styleSheets = (typeof url == 'array' ? url : getStyleSheets(url,media));
for(var i=0,len=styleSheets.length;i<len;i++){
//for(var i=0;i<styleSheets.length;i++){
var rules = styleSheets[i].cssRules || styleSheets[i].rules;
if(!rules) continue;
selector = selector.toUpperCase();
for(var j=0,len=rules.length;j<len;j++){
if(rules[j].selectorText&&rules[j].selectorText.toUpperCase() == selector){
for(property in styles){
if(!styles.hasOwnProperty(property)) continue;
rules[j].style[camelize(property)] = styles[property];
}
}
}
}
}
for(var i=0,len=styleSheets.length;i<len;i++){
for(var i=0;i<styleSheets.length;i++){
这两句话有点问题
用**for(var i=0,len=styleSheets.length;i<len;i++){**页面会报错
TypeError: styleSheets[i] is undefined但是代码仍然执行成功没有中断
for(var i=0;i<styleSheets.length;i++){这样写就不报错为什么