js实现数组去重复/获取日期

Array.prototype.unique3 = function(){
var res = [];
var json = {};
for(var i = 0; i < this.length; i++){

if(!json[this[i]]){
res.push(this[i]);
json[this[i]] = 1;
}
}
return res;
}
var arr = [112,112,34,'你好',112,112,34,'你好','str','str1'];
alert(arr.unique3());//112 34 你好 str str1

Array.prototype.unique2 = function(){
this.sort(); //先排序
var res = [this[0]];
for(var i = 1; i < this.length; i++){
if(this[i] !== res[res.length - 1]){
res.push(this[i]);
}
}
return res;
}
var arr = [1, 'a', 'a', 'b', 'd', 'e', 'e', 1, 0]
alert(arr.unique2());//1 a b d e 0

new function(){
with(new Date())
{
var t=function(a){return a<10? "0"+a:a;}
alert(getFullYear()+"年"+t(getMonth()+1)+"月"+t(getDate())+"日"+t(getHours())+"时"+t(
getMinutes()
)+"分"+t(getSeconds())+"秒");
}
}