watch属性 

<body>
    <div id="app">
       
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                message:'hello world'

            },
            watch:{
                message(newValue,oldValue){ //监听message值变化
                    console.log("新的值：",newValue);
                    console.log("旧的值：",oldValue);
                }
            }
        })
    </script>
</body>

 

 

posted @ 2022-02-27 10:40  iTao0128  阅读(50)  评论(0)    收藏  举报