js常用方法

Array.prototype.delRepeat = function () {//删除重复数据
 var newArray = [];
 var provisionalTable = {};
 for (var i = 0, item; (item = this[i]) != null; i++) {
  if (!provisionalTable[item]) {
   newArray.push(item);
   provisionalTable[item] = true;
  }
 }
 return newArray;
};