var arr = [{   //对象数组
    num: 1,
    t: '111'
}, {
    num: 5,
    t: '555'
}, {
    num: 6,
    t: '666'
}, {
    num: 3,
    t: '333'
}];   
arr.sort(function(a, b) {
    //return a.num - b.num;   //从小到大排
    //return b.num - a.num;   //从大到小排
    //return Math.random() - 0.5;   //数组洗牌
});