javascript 操作 css Rule

 1 //add   addCssRule(‘.bcd‘,{‘color‘:‘red‘,‘font-weight‘:‘bold‘,‘font-size‘:‘12px‘},document.styleSheets[1]);
 2     function addCssRule(selector,styles,styleSheet,index){
 3         var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet],
 4             style = ‘‘,
 5             declaration = ‘‘;
 6         for(var pro in styles){
 7             if(styles.hasOwnProperty(pro)){
 8                 declaration += (pro + ‘:‘ + styles[pro] + ‘;‘);
 9             }
10         }
11         style = selector + ‘{‘ + declaration + ‘}‘;
12         for(var i = 0,j = sheets.length; i < j;i++){
13             if(sheets[i].insertRule){
14                 index = index >= 0 ? index : sheets[i][‘cssRules‘].length;
15                 sheets[i].insertRule(style,index);
16             }else if(sheets[i].addRule){  //IE
17                 index = index >= 0 ? index : -1;  //-1为末尾
18                 sheets[i].addRule(selector,declaration,index);
19             }
20         }
21     }
22   
23     //modify   editCssRule(‘.abc‘,{‘font-weight‘:‘bold‘,‘font-size‘:‘14px‘},document.styleSheets[1]);
24     function editCssRule(selector,styles,styleSheet){
25         var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet];
26         selector = selector.toUpperCase(); // ie9以下标签选择器默认是大写   这里统一下
27         //对大小写敏感的selector 会有问题
28         for(var i = 0,j = sheets.length; i < j;i++){
29             var rules = sheets[i][‘cssRules‘] || sheets[i][‘rules‘];   //ie为 rules
30             if(!rules){ continue;}
31             for(var m = 0,n = rules.length;m < n;m++){
32                 if(rules[m][‘selectorText‘].toUpperCase() == selector){
33                     for(var pro in styles){
34                         if(styles.hasOwnProperty(pro)){
35                             rules[m].style[cssCamilize(pro)] = styles[pro];
36                         }
37                     }
38                 }
39             }
40         }
41     }
42   
43     //del   delCssRule(‘.bcd‘,document.styleSheets[1]);
44     function delCssRule(selector,styleSheet,index){
45         var sheets = styleSheet instanceof Array ? styleSheet : [styleSheet];
46         selector = selector.toUpperCase();
47         for(var i = 0,j = sheets.length; i < j;i++){
48             var rules = sheets[i][‘cssRules‘] || sheets[i][‘rules‘];   //ie为 rules
49             if(index >=0 && index < rules.length){
50                 sheets[i].deleteRule ? sheets[i].deleteRule(index) : sheets[i].removeRule(index);
51             }else if(selector){
52                for(var m = 0,n = rules.length;m < n;m++){
53                     if(rules[m][‘selectorText‘].toUpperCase() == selector){
54                        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
55                     }
56                 }
57             }else{
58                 return false;
59             }
60         }
61     };
62   
63 function cssCamilize(str){
64         return str.replace(/-(\w)/g,function($1,$2){
65             return $2.toUpperCase();
66         });
67     };