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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>array-remove-repeate</title>
<style>
.tt{ background-color:#006699; height:3px; overflow:hidden;}
</style>
<script src="../Watch.js"></script>
<script src="demo.js"></script>
</head>
<body>
<div class="tt"></div>
<div class="result" id="result"></div>
<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;
}
var test=(function()
{
var arr2=[];
for(var i=0;i<2000;i++)
{
var t=i;
t=parseInt(Math.random()*2000)+1;
arr2[i]=(t.toString());
}
//arr2=["zhoujian","zhou","zhou"];
return function(){
return arr2;
//return [1,2,3,3];
};
})();
window.onload=function(){
//
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>
</body>
</html>
