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Vue还有这种骚操作？浅析几个新手常常忽略的API
source link: https://juejin.im/post/5adc99f56fb9a07abd0d3ee7
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一：实现子组件与父组件双向绑定的【sync】修饰符：一般来说，我们实现父子组件值的传递通常使用的是【props】和自定义事件【$emit】。父组件通过【props】将值传给子组件，子组件通过【$emit】将值传给父组件，父组件通过【$on】事件获取子组件传过来
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