js清除数组中重复数据

var uniq = function (arr) {
    var a = [],
        o = {},
        i,
        v,
        len = arr.length;

    if (len < 2) {
        return arr;
    }

    for (i = 0; i < len; i++) {
        v = arr[i];
        if (o[v] !== 1) {
            a.push(v);
            o[v] = 1;
        }
    }

    return a;
}

参见：http://www.planabc.net/2009/12/26/array_uniq/