javascript 操作 css Rule

//add   addCssRule('.bcd',{'color':'red','font-weight':'bold','font-size':'12px'},document.styleSheets[1]);
    function addCssRule(selector,styles,styleSheet,index){
        var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet],
            style = '',
            declaration = '';
        for(var pro in styles){
            if(styles.hasOwnProperty(pro)){
                declaration += (pro + ':' + styles[pro] + ';');
            }
        }
        style = selector + '{' + declaration + '}';
        for(var i = 0,j = sheets.length; i < j;i++){
            if(sheets[i].insertRule){
                index = index >= 0 ? index : sheets[i]['cssRules'].length;
                sheets[i].insertRule(style,index);
            }else if(sheets[i].addRule){  //IE
                index = index >= 0 ? index : -1;  //-1为末尾
                sheets[i].addRule(selector,declaration,index);
            }
        }
    }
  
    //modify   editCssRule('.abc',{'font-weight':'bold','font-size':'14px'},document.styleSheets[1]);
    function editCssRule(selector,styles,styleSheet){
        var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet];
        selector = selector.toUpperCase(); // ie9以下标签选择器默认是大写   这里统一下
        //对大小写敏感的selector 会有问题
        for(var i = 0,j = sheets.length; i < j;i++){
            var rules = sheets[i]['cssRules'] || sheets[i]['rules'];   //ie为 rules
            if(!rules){ continue;}
            for(var m = 0,n = rules.length;m < n;m++){
                if(rules[m]['selectorText'].toUpperCase() == selector){
                    for(var pro in styles){
                        if(styles.hasOwnProperty(pro)){
                            rules[m].style[cssCamilize(pro)] = styles[pro];
                        }
                    }
                }
            }
        }
    }
  
    //del   delCssRule('.bcd',document.styleSheets[1]);
    function delCssRule(selector,styleSheet,index){
        var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet];
        selector = selector.toUpperCase();
        for(var i = 0,j = sheets.length; i < j;i++){
            var rules = sheets[i]['cssRules'] || sheets[i]['rules'];   //ie为 rules
            if(index >=0 && index < rules.length){
                sheets[i].deleteRule ? sheets[i].deleteRule(index) : sheets[i].removeRule(index);
            }else if(selector){
               for(var m = 0,n = rules.length;m < n;m++){
                    if(rules[m]['selectorText'].toUpperCase() == selector){
                       sheets[i].deleteRule ? sheets[i].deleteRule(m) : sheets[i].removeRule(m);;  //可能存在多个一样的selector  全部删除
                    }
                }
            }else{
                return false;
            }
        }
    };
  
function cssCamilize(str){
        return str.replace(/-(w)/g,function($1,$2){
            return $2.toUpperCase();
        });
    };

//参考：http://www.cnblogs.com/2050/p/4029656.html
function addCSS(cssText){
    var style = document.createElement('style'),  //创建一个style元素
        head = document.head || document.getElementsByTagName('head')[0]; //获取head元素
    style.type = 'text/css'; //这里必须显示设置style元素的type属性为text/css，否则在ie中不起作用
    if(style.styleSheet){ //IE
        var func = function(){
            try{ //防止IE中stylesheet数量超过限制而发生错误
                style.styleSheet.cssText = cssText;
            }catch(e){

            }
        }
        //如果当前styleSheet还不能用，则放到异步中则行
        if(style.styleSheet.disabled){
            setTimeout(func,10);
        }else{
            func();
        }
    }else{ //w3c
        //w3c浏览器中只要创建文本节点插入到style元素中就行了
        var textNode = document.createTextNode(cssText);
        style.appendChild(textNode);
    }
    head.appendChild(style); //把创建的style元素插入到head中    
}