vue3 关闭watch

在Vue3中，要关闭watch监听，只需要调用watch函数返回的函数即可。根据提供的代码示例，可以看到在声明了watch函数后，将其赋值给了一个名为flag的变量。当达到某个条件时，可以调用flag函数来关闭watch监听。在代码示例中，当data.val大于等于6时，调用flag函数即可结束监听。这样就实现了关闭watch的功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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