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I found the reason. I added a keep-alive to the router-view before, causing the component to be cached, so beforeDestory and destoryed will not be triggered

I tried it, and it can trigger the execution of the beforeDestroy method when switching routes. The example is as follows.

const Home = {
        template: `
      <p>
      <p class="section">Some section foo</p>
      <p class="section">Some section foo</p>
      <p class="section">Some section foo</p>
      <p class="section">Some section foo</p>
    </p>
  `,
        mounted() {
           console.log("Home mounted");
        },
        beforeDestroy() {
            console.log("Home destroy");
        }
    };

    const Test = {
        template: `
            <p>
              <p class="section">Some section test</p>
              <p class="section">Some section test</p>
              <p class="section">Some section test</p>
              <p class="section">Some section test</p>
            </p>
  `,
        mounted() {
            console.log("Test mounted");
        },
        beforeDestroy() {
            console.log("Test destroy");
        }
    };