vue里面本身带有两个回调函数:一个是`Vue.nextTick(callback)`,当数据发生变化,更新后执行回调。另一个是`Vue.$nextTick(callback)`,当dom发生变化,更新后执行的回调。栗子:...<ul id="demo"><li v-for="item in list">{{item}}</div></ul>...new Vue({el:'#demo',data:{list=[0,1,2,3,4,5,6,7,8,9,10]},methods:{push:function(){this.list.push(11);this.nextTick(function(){alert('数据已经更新')});this.$nextTick(function(){alert('v-for渲染已经完成')})}}})