JS 数组排序

<script>
 
if(!console)
{
	var console={};
	console.log=function(str){alert(str);}
}

Array.prototype.unique1 = function () {
    var r = new Array();
    label:for(var i = 0, n = this.length; i < n; i++) {
        for(var x = 0, y = r.length; x < y; x++) {
            if(r[x] == this[i]) {
                continue label;
            }
        }
        r[r.length] = this[i];
    }
    return r;
}

Array.prototype.unique2 = function () {
    return this.sort().join(",,").replace(/(,|^)([^,]+)(,,\2)+(,|$)/g,"$1$2$4").replace(/,,+/g,",").replace(/,$/,"").split(",");
}

Array.prototype.unique3 = function() {
    var temp = {}, len = this.length;
    for(var i=0; i < len; i++)  {
        var tmp = this[i];
        if(!temp.hasOwnProperty(tmp)) {
            temp[this[i]] = "my god";
        }
    }
 
    len = 0;
	var tempArr=[];
    for(var i in temp) {
        tempArr[len++] = i;
    }
    return tempArr;
}
Array.prototype.unique4 = function () {
    var temp = new Array();
      this.sort();
      for(i = 0; i < this.length; i++) {
          if( this[i] == this[i+1]) {
            continue;
        }
          temp[temp.length]=this[i];
      }
      return temp;
 
}
Array.prototype.unique5 = function() {
	var res = [], hash = {};
    for(var i=0, elem; (elem = this[i]) != null; i++)  {
		if (!hash[elem])
		{
			res.push(elem);
			hash[elem] = true;
		}
    }
	return res;
}
 
var test=(function()
{
	var arr2=[];
	for(var i=0;i<20000;i++)
	{
		var t=i;
		t=parseInt(Math.random()*2000)+1;
		arr2[i]=(t.toString());
	}
	
	return function(){return arr2};
})();
window.οnlοad=function(){
    	//---serf
	Watch.start("Cost times5:");
    arr= test();
    console.log(arr.length);
    arr=arr.unique5();
    console.log(arr.length);
    Watch.stop(); 
	
	
	//
    Watch.start("Cost times1:");
    var arr= test();
    console.log(arr.length );
    arr=arr.unique1();
    console.log(arr.length);
    Watch.stop();


    //
	Watch.start("Cost times2:");
	arr= test();
    console.log(arr.length);
    arr=arr.unique2();
    console.log(arr.length);
    Watch.stop();


    //
	Watch.start("Cost times3:");
	arr= test();
    console.log(arr.length );
	arr=arr.unique3();//数组很大时，最快
    console.log(arr.length );
    Watch.stop();

 
	
    //
    Watch.start("Cost times4:");
    arr= test();
    console.log(arr.length);
    arr=arr.unique4();
    console.log(arr.length);
    Watch.stop();

    Watch.report();
}
</script>