js数组去重复：

Array.prototype.distinct = function () {
    var arr = this,
        result = [],
        i,
        j,
        len = arr.length;
    for (i = 0; i < len; i++) {
        for (j = i + 1; j < len; j++) {
            if (arr[i] === arr[j]) {
                j = ++i;
            }
        }
        result.push(arr[i]);
    }
    return result;
}

调用：

var arr = [1,2,3].distinct();