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                         //=>3.js第二种方式                     //  for (var i=0; i<ulList.length; i++){                     //      switch ( i % 3) {                     //           case 0:                     //            ulList[i].className = "bgColorYellow";                     //            break;                     //            case 1:                     //            ulList[i].className = "bgColorRed";                     //            break;                     //            case 2:                     //            ulList[i].className = "bgColorBlue";                     //            break; 
//      }                     //  }             //=>4.js第三种方式  colorArray+bgColorYellow...                //  var colorArray = ["bgColorYellow","bgColorRed", "bgColorBlue"];                // for (var i=0; i<ulList.length; i++){                      //=> 分析: i%3=0 "bgColorYellow" colorArray[0]                      //=>        i%3=1  "bgColorBlue"  colorArray[1]                      //=>        i%3=2  "bgColorRed"   colorArray[2]                      //=> i%3的余数是多少?就是我们当前需要到数组中通过此索引找到的样式类,而这个样式类则是当前li需要设置的class                    //       ulList[i].className = colorArray[i % 3];                                             //   }             //=>5.js第四种方式                      // for (var i=0; i<ulList.length; i++){                     //     ulList[i].className = 'bg'+ (i%3); //=>隔三行变色修改样式类                     //     //=>在改变之前把原有的样式类信息存储到自定义属性中                     //     ulList[i].myOldClass= ulList[i].className;                         (编辑:泰州站长网) 
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