js去除数组重复

http://www.nowamagic.net/librarys/veda/detail/1487

http://bbs.chinaunix.net/thread-3650610-1-1.html

http://www.phpernote.com/php-function/516.html

1例子

//去除数组的重复值，使用方式:arr.del()
Array.prototype.del = function () {
    var a = {}, c = [], l = this.length;
    for (var i = 0; i < l; i++) {
        var b = this[i];
        var d = (typeof b) + b;
        if (a[d] === undefined) {
            c.push(b);
            a[d] = 1;
        }
    }
    return c;
}

使用例子：
var arr = new Array();
arr = [1,2,3,4,3,4,5,9,7,5,6];

alert(arr.del());
结果：1，2，3，4，5，6，7，9