一、watch 属性
通过 watch 来响应数据的变化
<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue</title><script src="/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>
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