Vue之监听数据变化

1.轻度监视window.onload=function(){var vm=new Vue({el:'#box',data:{a:111,

程序员库里

13179人浏览 · 2017-09-24 14:25:38

程序员库里 · 2017-09-24 14:25:38 发布

1.轻度监视

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue.js"></script>
    <script>


        window.οnlοad=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    a:111,
                    b:2
                }
            });

            vm.$watch('a',function(){
                alert('发生变化了');

                this.b=this.a+100;
            });

            document.οnclick=function(){
                vm.a=1;
            };
        };

    </script>
</head>
<body>
    <div id="box">
        {{a}}
        <br>
        {{b}}
    </div>

</body>
</html>

初始状态：

点击完后：

2.深度监视：deep:true

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue.js"></script>
    <script>


        window.οnlοad=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    json:{name:'strive',age:16},
                    b:2
                }
            });

            vm.$watch('json',function(){
                alert('发生变化了');
            },{deep:true});

            document.οnclick=function(){
                vm.json.name='aaa';
            };
        };

    </script>
</head>
<body>
    <div id="box">
        {{json | json}}
        <br>
        {{b}}
    </div>

</body>
</html>

Vue

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