js給Array數組增加chunk方法.
    Array.prototype.chunk = function(n){
    for(var i = 0, temp = [], l = ~~this.length / n; temp.length < l; temp[i++] = this.splice(0, n));
    return temp;
    }
    var array = '173IT技術網很棒，中國人民很行'.split('')
    // to use
    array .chunk(2)
    array .chunk(3)