vue3 setup语法糖中的watch

在Vue3的setup语法糖中，可以使用watch函数来监听数据的变化。watch函数接受两个参数，第一个参数是要监听的值，可以是单个值或者是一个数组包含多个值。第二个参数是一个回调函数，当监听的值发生变化时，这个回调函数会被调用。回调函数接收两个参数，分别是新值和旧值。通过在回调函数中编写副作用逻辑，可以实现对数据变化的响应。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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