判断是不是重复，用的是Object的key，要注意的是数字转key会变成字符串。

var array = [0,0,0,1,2,3,"1",undefined,undefined];        var len = array.length;        var result = [];        var keys = {};        for(var index = 0;index < len;index ++){            var temp = array[index];            var type = typeof temp;            if(!keys[temp]){                keys[temp] = [type];                result.push(temp);            }else if(keys[temp].indexOf(type) == -1){
   //"1"跟1的key会冲突，都是"1"，所以要根据类型进行判断                keys[temp].push(type);                result.push(temp);            }        }

输出:0,1,2,3,1,    最后一位字符串是undefined