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[vue] 说说你对proxy的理解 #359

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haizhilin2013 opened this issue Jun 20, 2019 · 2 comments
Open

[vue] 说说你对proxy的理解 #359

haizhilin2013 opened this issue Jun 20, 2019 · 2 comments
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@haizhilin2013
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[vue] 说说你对proxy的理解
@haizhilin2013 haizhilin2013 added the vue vue label Jun 20, 2019
@Myh-cs
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Myh-cs commented Jul 9, 2019

目前只知道用来修改 属性的get set方法 vue3 来替换Object.defineProperty。一方面提高性能 另一方面可以免去给数组重写方法。

@xiaoliuer
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vue的数据劫持有两个缺点:
1、无法监听通过索引修改数组的值的变化
2、无法监听object也就是对象的值的变化
所以vue2.x中才会有$set属性的存在

proxy是es6中推出的新api，可以弥补以上两个缺点，所以vue3.x版本用proxy替换object.defineproperty

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@haizhilin2013 @Myh-cs @xiaoliuer