vue混入mixins时注意的问题

mixin.js - 方式一：导出对象

const mixin = {
  mounted () {
    console.log('fffffffffffff')
  },
  methods: {
  }
}

export { mixin }

使用时，就应该使用对象的方式导入，即：{ mixin }

import { mixin } from './mixins/mixin'

export default {
  mixins: [mixin]
}

mixin.js - 方式二：导出变量

const mixin = {
  mounted () {
    console.log('fffffffffffff')
  },
  methods: {
  }
}

export default mixin

使用时，就应该使用变量的方式导入，即：mixin

import { mixin } from './mixins/mixin'

export default {
  mixins: [mixin]
}

总结：导出导入方式要一致，否则就无法混入，会报错：Cannot read property 'components' of undefined