Chrome下测试结果：
unique1: 1188
unique2: 39
unique3: 10
unique4: 30
unique5: 5
IE下测试结果：
unique1: 1417
unique2: 24
unique3: 9
unique4: 7
unique5: 4
FF下测试结果：
unique1: 1812
unique2: 20
unique3: 15
unique4: 3
unique5: 11
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>array-remove-repeate</title>
<style>
.tt {
background-color: #006699;
height: 3px;
overflow: hidden;
}
</style>
</head>
<body>
<h4>测试结果</h4>
<div class="result" id="result"></div>
<script>
var output = function(str) {
result.innerHTML += str + '<br/>'
}
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() * 20000) + 1;
arr2[i] = (t.toString());
}
return function() {
return arr2;
};
})();
window.onload = function() {
var aa01, aa02, aa03, aa04, aa05;
var bb01, bb02, bb03, bb04, bb05;
var arr;
arr = test();
aa01 = new Date();
arr = arr.unique1();
bb01 = new Date();
output('unique1: ' + (bb01.getTime() - aa01.getTime()));
arr = test();
aa02 = new Date();
arr = arr.unique2();
bb02 = new Date();
output('unique2: ' + (bb02.getTime() - aa02.getTime()));
arr = test();
aa03 = new Date();
arr = arr.unique3();
bb03 = new Date();
output('unique3: ' + (bb03.getTime() - aa03.getTime()));
arr = test();
aa04 = new Date();
arr = arr.unique4();
bb04 = new Date();
output('unique4: ' + (bb04.getTime() - aa04.getTime()));
arr = test();
aa05 = new Date();
arr = arr.unique5(); // 这种最快
bb05 = new Date();
output('unique5: ' + (bb05.getTime() - aa05.getTime()));
}
</script>
</body>
</html>