Vue报错笔记（1）vue.js:515 [Vue warn]: Property or method "name" is not defined on the instance but refere

报错：

vue.js:515 [Vue warn]: Property or method "name" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option. (found in root instance)

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解决：
ctrl+f 搜索代码里面哪里使用了name,就是你使用了但是在data里面没有定义

name没有定义,设置一个初始值即可

name 在data那里没有定义。
要这样定义：

export default {    name: 'app',    data() {        return {           name: ''        }    },    ......