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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Vue 测试实例 - 小鸟启蒙(facesoho.com)</title> <script src="https://cdn.staticfile.org/vue/2.4.2/vue.min.js"></script> </head> <body> <div id = "computed_props"> 千米 :<input type = "text" v-model = "kilometers"> 米 :<input type = "text" v-model = "meters"> </div> <p id="info"></p> <script type = "text/javascript"> var vm = new Vue({ el:'#computed_props', data:{ kilometers :0, meters:0 }, methods:{ }, computed :{ }, watch :{ kilometers:function(val) { this.kilometers = val; this.meters = this.kilometers * 1000 }, meters :function (val) { this.kilometers = val/ 1000; this.meters = val; } } }); // $watch 是一个实例方法 vm.$watch('kilometers', function (newValue, oldValue) { // 这个回调将在 vm.kilometers 改变后调用 document.getElementById ("info").innerHTML = "修改前值为:" + oldValue + "，修改后值为:" + newValue; }) </script> </body> </html>
运行结果