vue2的watch和vue3的差别

在Vue 2中，可以使用watch选项或$watch方法来创建一个监听器。watch选项用于定义一个或多个被监听的数据，并指定一个处理函数来响应数据变化。watch选项的写法比较灵活，可以是一个对象，也可以是一个函数。还可以使用deep和immediate属性来指定深度监听和立即执行处理函数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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