vue中watch侦听器 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <p>{{msg}}</p>
    <button @click="clickHandler">修改</button>

</div>
<script src="vue.js"></script>
<script>
    let vm=new Vue({
        el:'#app',
        data(){
            return{
                msg:'lv',
                age:89,

            }
        },
        methods:{
            clickHandler(){
                //this指向的是当前对象
                this.msg='xiao';
                // this.age=89;
            },

        },
        watch:{
            //watch监听多个属性,要想监听多个属性,声明多个属性金廷
            msg:function(value){
                console.log(value);
                if (value==='xiao'){
                      this.msg = '大xingxing'

                }


            }
        }
    })
</script>
</body>
</html>

 

posted @ 2018-12-01 16:48  团子emma  阅读(90)  评论(0)    收藏  举报