vue学习笔记

1. watch与computed的描述

watch

watch : {firstName : function(val){console.log(val);this.fullName = val + "." + this.lastName;},lastName : function(val){this.fullName = this.firstName + "." + val;}},

当fistName变化时，会执行响应的方法。相当于在监听fistName的值

computed

computed : {c : function(){return this.b + "." + this.a}}

当b或者c变化时，会自动更新c的值，相当于一次监听了a和b的值

但是要注意的是，c在data中不能定义。如：

data : {firstName : "fist",lastName : "last",fullName : "fist.last",a : "1",b : "2"},