vue keepalive 组件内js控制html背景色

    onActivated(() => {
      let html = document.getElementsByTagName("html") as any;
      html = html[0];
      html.style.backgroundColor = "#f2f2f4";
    });
    onDeactivated(() => {
      let html = document.getElementsByTagName("html") as any;
      html = html[0];
      html.style.backgroundColor = "";
    });

组件生命周期中利用JS控制