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js技巧：十几行的代码实现vue.watch
source link: https://juejin.im/post/5b0408f2f265da0ba17cda08
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最近忙得狗一样，有一段时间没有更新了，虽然是僵尸博主，但是有点小收获还是要来唠叨一下的。 相信很多的用vue的人都知道vue双向绑定的原理建立在，给属性绑定了getter和setter，在属性被改变的同时触发视图的再渲染。而本期也是借助这两个内置方法实现vu
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