Implementation code for removing duplicate items from javascript numeric array_javascript skills

test.htm

复制代码 代码如下:

<script> <br><br>if(!console) <br>{ <br>var console={}; <br>console.log=function(str){alert(str);} <br>} <br><br>Array.prototype.unique1 = function () { <br>var r = new Array(); <br>label:for(var i = 0, n = this.length; i < n; i ) { <BR>for(var x = 0, y = r.length; x < y; x ) { <BR>if(r[x] == this[i]) { <BR>continue label; <BR>} <BR>} <BR>r[r.length] = this[i]; <BR>} <BR>return r; <BR>} <br><br>Array.prototype.unique2 = function () { <BR>return this.sort().join(",,").replace(/(,|^)([^,] )(,,2) (,|$)/g,"$1$2$4").replace(/,, /g,",").replace(/,$/,"").split(","); <BR>} <br><br>Array.prototype.unique3 = function() { <BR>var temp = {}, len = this.length; <BR>for(var i=0; i < len; i ) { <BR>var tmp = this[i]; <BR>if(!temp.hasOwnProperty(tmp)) { <BR>temp[this[i]] = "my god"; <BR>} <BR>} <br><br>len = 0; <BR>var tempArr=[]; <BR>for(var i in temp) { <BR>tempArr[len ] = i; <BR>} <BR>return tempArr; <BR>} <BR>Array.prototype.unique4 = function () { <BR>var temp = new Array(); <BR>this.sort(); <BR>for(i = 0; i < this.length; i ) { <BR>if( this[i] == this[i 1]) { <BR>continue; <BR>} <BR>temp[temp.length]=this[i]; <BR>} <BR>return temp; <br><br>} <br><br><BR>var test=(function() <BR>{ <BR>var arr2=[]; <BR>for(var i=0;i<2000;i ) <BR>{ <BR>var t=i; <BR>t=parseInt(Math.random()*2000) 1; <BR>arr2[i]=(t.toString()); <br><br><BR>} <BR>//arr2=["zhoujian","zhou","zhou"]; <BR>return function(){ <BR>return arr2; <BR>//return [1,2,3,3]; <BR>}; <br><br><BR>})(); <BR>window.onload=function(){ <br><br><BR>// <BR>Watch.start("Cost times1:"); <BR>var arr= test(); <BR>console.log(arr.length ); <br><br>arr=arr.unique1(); <BR>console.log(arr.length); <br><br>Watch.stop(); <BR>// <BR>Watch.start("Cost times2:"); <BR>arr= test(); <BR>console.log(arr.length); <br><br><BR>arr=arr.unique2(); <br><br>console.log(arr.length); <br><br>Watch.stop(); <BR>// <BR>Watch.start("Cost times3:"); <BR>arr= test(); <BR>console.log(arr.length ); <br><br>arr=arr.unique3();//数组很大时，最快 <br><br>console.log(arr.length ); <br><br>Watch.stop(); <br><br>// <br><br>Watch.start("Cost times4:"); <BR>arr= test(); <BR>console.log(arr.length); <BR>arr=arr.unique4(); <BR>console.log(arr.length); <BR>Watch.stop(); <BR>Watch.report(); <br><br>} <BR></script>

Watch.js

复制代码 代码如下:

var Watch = {
result: [],
guid: -1,
totalTime: 0,
start: function(title){
this.result[ this.guid] = [title || this.guid, new Date().getTime()];
},
stop: function(){
var r = this.result[this.guid];
var t = new Date().getTime() - r[1];
this.totalTime = t;
r[1] = t;
if(t>=10000){
alert("This code takes too long to run,you should optimizate them.");
}
},
report: function(parent){
var div = document.createElement("div");
div.style.fontSize = "12px";
var str = [];
str.push("

The total times:" this.totalTime " ms.

");
for (var i = 0, l = this.result.length; i < l; i ) {
if (this.result[i].length > 1) {
str.push("

" "" "" this.result[i][1] "" " " this.result[i][0] "" "

");
}else{
str.push(this.result[i][0]);
}
}
div.innerHTML = str.join("");
parent = parent || document.body;
parent.appendChild(div);
div = null;

this.totalTime = 0;
this.guid = -1;
this.result=[];
},
fns: function(){
var a = arguments;
for (var i = 0, l = a.length; i < l; i ) {
this.start(a[i][0]);
a[i][1]();
this.stop();
}
},
execByTimes: function(fn, times, title){
this.start(title);
while (times--) {
fn();
}
this.stop();
},
print: function(str){
this.result[ this.guid]=[str];
}
}