这个函数用javascript怎么写？

写一个方法去掉一个数组的重复元素！谢谢。

---

Array.prototype.unique = function() {
var ret = [], done = {},o = this;
for ( var i=0,length=o.length; i <length; i++) {
if (!done[o[i]]){
done[o[i]] = true;
ret.push( o[i] );
}
}
return ret;
}


[MyArray].unique

---

JScript code:

function unique(arr) {
var o = {}, re = [];
for(var i = 0, len = arr.length; i < len; i++) {
if(o[arr[i]] === undefined) o[arr[i]] = arr[i];
}
for(var p in o) re[re.length] = p;

return re;
}
alert(unique([1,2,3,1,3,3,2]))

---

JScript code:

function unique(arr) {
var str = arr.join(','), re = [];
str.replace(/([^,]*)/g, function($0, $1, i) {
if(str.indexOf($1) == i) re[re.length] = $1;
});
return re;
}
alert(unique([1,2,3,1,3,3,2,4,4]))

---

JScript code:

function unique(arr) {
var str = arr.join(','), re = [];
str.replace(/([^,]+)/g, function($0, $1, i) {
if(str