Vue常见问题及处理

vue.js 2.0要求每个template只能有一个根元素。可以在最外层包一个div来解决这个问题。
vue.js:435 [Vue warn]: Error compiling template:
<h2>这是页头</h2>
<button>登录</button>
Component template should contain exactly one root element. If you are using v-if on multiple elements, use v-else-if to chain them instead.

解决方案：在最外边 包上一个容器（不允许直接返回多个元素）

额
vue.js:435 [Vue warn]: Unknown custom element: <my-footer> – did you register the component correctly? For recursive components, make sure to provide the “name” option.
原因：你把局部组件当成全局组件去使用了
解决方案：
正确的注册组件

3、 The “data” option should be a function that returns a per-instance value in component definitions.
原因：在组件中去初始化数据 不允许给data直接赋值一个对象
解决方案： Vue.component(”,{
data:function(){
return {}
}
})

4、Uncaught TypeError: Cannot read property ‘push’ of undefined
原因：push前面的那个变量，其实undefined
解决方案：
this 通过箭头函数来解决问题

5、ERROR in ./src/assets/img/favicon.icoModule parse failed: C:xampphtdocsframeworkvueprojecttplssrcassetsimgfavicon.ico Unexpected character ” (1:0)You may need an appropriate loader to handle this file type.(Source code omitted for this binary file)
解决方案：找到build/webpack.base.conf.js在41行加上 |ico
6、No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:8080’ is therefore not allowed access.
跨域问题