if(!Function.prototype.apply){     Function.prototype.apply = function(obj, args){         obj = obj == undefined ? window : Object(obj);//obj可以是js基本类型         var i = 0, ary = [], str;         if(args){             for( len=args.length; i<len; i++ ){                 ary[i] = "args[" + i + "]";             }         }         obj._apply = this;         str = 'obj._apply(' + ary.join(',') + ')';         try{             return eval(str);         }catch(e){         }finally{             delete obj._apply;         }        }; } if(!Function.prototype.call){     Function.prototype.call = function(obj){         var i = 1, args = [];         for( len=arguments.length; i<len; i++ ){             args[i-1] = arguments[i];         }         return this.apply(obj, args);     }; }