js去除select重复内容

js去除select重复内容

function del(obj){
  var items = document.getElementById(obj);  
  var sobj = (function(){
   var _sobj = {};
   for(var i=0; i     _sobj[items.options[i].text] = 1;
   }
   return _sobj;
  })();
  items.options.length = 0;
  var _cx = 0;
  for(var i in sobj){
   items.options[_cx] = new Option(i,i);
   _cx += 1;
  }
 }