2回答

• 

  guoyou

  2017-02-21 01:26:41

  function byClass(cls,parentId){

       var parents = parentId ? document.getElementById(parentId) : document,

       ele = parents.getElementsByTagName('*'),

       claArr = [];

       for(var i=0,len=ele.length; i<len; i++){

           var newClaArr = ele[i].className.split(" ");

           for(var j=0,lens=newClaArr.length; j<lens; j++){

               if ( newClaArr[j] === cls) {

                    claArr.push(ele[i]);

               }

           }

      

       }

       return claArr;

  }

  我这样写了之后可以

  <div class="box boxw"></div>

  <div class="box"></div>

  这些都匹配出来，

  
  

  
  

  但是当遇到有相同的项就蒙b了

  <div class="box box2 box"></div>

  <div class="box"></div>

  .....

  0 0
• 

  周晓雨

  2016-12-07 15:54:05

  嗯可以

  0 0