问在Javascript中随机化值

EN

var randomize = (function () {
    var memo = [],
        maxlen = 10;
    return function() {
        if (memo.length === maxlen) {
            throw new Error('Out of values');
        }
        var value = Math.floor(Math.random() * (maxlen + 1));
        if (memo.indexOf(value) !== -1) {
            return randomize();
        }
       memo.push(value);
       return value;
    };
}());

Array.prototype.unique = function () {
    var r = new Array();
    o: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 o;
            }
        }
        r[r.length] = this[i];
    }
    return r;
}

var temp = [];

//keep going until the array size is three
while(temp.length < 3) {
    temp.push(Math.floor(Math.random() * 11));
    //unique() will remove the dupes thus affecting the length 
    temp = temp.unique();
}

alert(temp[0] + ' ' + temp[1] + ' ' + temp[2]);