个回答

• jeSus_sCroSs

  2016-12-09 18:48:23

  function addClass(obj,sClass){

  var aClass=obj.className.split(' ');

  if(!obj.className){

  obj.className=sClass;

  return;

  }

  for(var i=0;i<aClass.length;i++){

  if(aClass[i] === sClass)return;

  }

  obj.className+=' '+sClass;

  }

  function removeClass(obj,sClass){

  var aClass=obj.className.split(' ');

  if(!obj.className)return;

  for(var i=0;i<aClass.length;i++){

  if(aClass[i] === sClass){

  aClass.splice(i,1);

  obj.className=aClass.join('');

  break;

  }

  }

  }

  
  

  0

• 追觅梦初的国度

  2016-07-23 13:33:45

  不用自己写的，用classList或是jq的addclass就行了

  0

• imooc_hcy

  2015-09-22 11:19:35

  function addClass(element,newclass){
      if(element.className){
          oldClass=element.className;
          element.className=oldClass+" "+newclass;
      }else{
          element.className=newclass;
      }
  }

  
  

  1