文章目录一、Vue中watch用法二、handler方法和immediate属性三、deep属性（深度监听，常用语对象下面属性的改变）一、Vue中watch用法当data中的数据变化时，watch监听到并且执行<template><div><p>大名: {{fullName}}</p><p>名称: <input type="text

文章目录前言一、跨域是什么？二、解决跨域的办法前言跨域错误信息Access to XMLHttpRequest at ‘http://192.168.2.92:3000/api/b/home’ from origin ‘http://localhost:8080’ has been blocked by CORS policy: Response to preflight request does