分时函数的通用实现

var timeChunk = function(ary,fn,count){
        var obj,
            t;
        var len = ary.length;

        var start = function(){
            for(var i=0; i<Math.min(count || 1, ary.length); i++){
                var obj = ary.shift();
                fn(obj);
            }
        };

        return function(){
            t = setInterval(function(){
                if(ary.length === 0){//如果全部节点都已经被创建好
                    return clearInterval(t);
                }
                start();
            },200);//分批执行的时间间隔，也可以用参数的形式传入
        };
    };

//调用

var ary = [];

for(var i=1; i<=100; i++){
    ary.push(i);
}

var renderFriendList = timeChunk(ary,function(n){
    var div = document.createElement('div');
    div.innerHTML = n;
    document.body.appendChild(div);
},8);

renderFriendList();