watch 监听多个值用​​[ ]​​​括起来, ​​,​​分割

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <div id="app" >
      <input type="text" name="" id="" vsalue="" v-model="myBrand" />
      {{myBrand}}<!-- 可以使用这样取值 -->

    </div>

  </body>
  <script src="js/vue3.js"></script>
  <script>  
    const app=Vue.createApp({
      setup(props,context){
        const {ref,watch}=Vue;
        let myBrand=ref('xxx');
        let site=ref('xxxxsss');
        //    同时监听一个
        watch(myBrand,(currentB,preB)=>{
          console.log("现在的值"+currentB+"之前的值"+preB);
        },{});
        //    同时监听两个
        watch([myBrand,site],([currentB,preB],[currentS,preS])=>{
          console.log("现在的值"+currentS+"之前的值"+preS);
        },{});

        return{
          myBrand
        }


      }

    });

     app.mount("#app");

  </script>
</html>