Uncaught TypeError: Cannot read property of undefined

简介: vue中出现这种错误导致这种错误产生的原因是在选项 property 或回调上使用箭头函数created: () => console.log(this.a) 或 vm.$watch('a', newValue => this.myMethod())12因为箭头函数并没有 this,this 会作为变量一直向上级词法作用域查找,直至找到为止

vue中出现这种错误

Uncaught TypeError: Cannot read property of undefined
 或 Uncaught TypeError: this.myMethod is not a function


导致这种错误产生的原因是在选项 property 或回调上使用箭头函数

created: () => console.log(this.a) 
或 vm.$watch('a', newValue => this.myMethod())

因为箭头函数并没有 this,this 会作为变量一直向上级词法作用域查找,直至找到为止

目录
相关文章
|
4月前
|
存储 JavaScript 前端开发
成功解决:Cannot read properties of undefined (reading ‘commit‘)
这篇文章提供了解决Vuex中"Cannot read properties of undefined (reading 'commit')"错误的两种方法:检查模板中的数据属性是否存在,以及确保在Vue实例中正确挂载了store对象。
成功解决:Cannot read properties of undefined (reading ‘commit‘)
|
4月前
|
定位技术 Apache
Echarts——Invalid geoJson format Cannot read property 'length' of undefined
Echarts——Invalid geoJson format Cannot read property 'length' of undefined
92 0
|
4月前
|
JavaScript
VUE——filemanager-webpack-plugin报错TypeError: Cannot read property 'isFile' of undefined
VUE——filemanager-webpack-plugin报错TypeError: Cannot read property 'isFile' of undefined
85 0
|
4月前
|
前端开发 JavaScript
VUE——Uncaught (in promise) TypeError: Cannot read property '__esModule' of undefined
VUE——Uncaught (in promise) TypeError: Cannot read property '__esModule' of undefined
85 0
|
6月前
|
前端开发 小程序 JavaScript
微信小程序-Unhandled promise rejection TypeError: Cannot read property ‘get‘ of undefined
微信小程序-Unhandled promise rejection TypeError: Cannot read property ‘get‘ of undefined
|
7月前
|
资源调度 前端开发
编译第三方前端项目时候出现Syntax Error: TypeError: Cannot set properties of undefined (setting ‘parent‘)
编译第三方前端项目时候出现Syntax Error: TypeError: Cannot set properties of undefined (setting ‘parent‘)
489 0
TypeError: Cannot set properties of undefined (setting ‘resdata‘),res定义数据出现的问题,定义的方法用this换成that
TypeError: Cannot set properties of undefined (setting ‘resdata‘),res定义数据出现的问题,定义的方法用this换成that
Cannot read properties of undefined (reading ‘row‘)
Cannot read properties of undefined (reading ‘row‘)
Cannot read properties of undefined (reading ‘post‘)
Cannot read properties of undefined (reading ‘post‘)
|
5月前
|
JavaScript
element-ui Cannot read properties of undefined (reading ‘name‘),data中写成集合的形式
element-ui Cannot read properties of undefined (reading ‘name‘),data中写成集合的形式