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vue-demo

于 2022-07-07 发布 文件大小:505.53 kB
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什么时候需要用的Vue.nextTick() 你在Vue生命周期的created()钩子函数进行的DOM操作一定要放在Vue.nextTick()的回调函数中。原因是什么呢,原因是在created()钩子函数执行的时候DOM 其实并未进行任何渲染,而此时进行DOM操作无异于徒劳,所以此处一定要将DOM操作的js代码放进Vue.nextTick()的回调函数中。与之对应的就是mounted钩子函数,因为该钩子函数执行时所有的DOM挂载已完成。使用时机:el 被新创建的 vm.$el 替换,并挂载到实例上去之后调用该钩子函数,此时页面并未全部渲染。 在某个动作有可能改变DOM元素结构的时候,对DOM一系列的js操作都要放进Vue.nextTick()的回调函数中

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