网上有用的解决方法：vue 国际化在弹出框中$t()报错：TypeError: Cannot read property '_t' of undefined
大佬给出的解决方法：
弹窗是一个新的Vue对象，只需要单独给弹窗重新绑定i18n即可。
代码：
// dialog/main.js
import customDialog from './dialog.vue'
import i18n from '@/i18n'
const NewDialog = Vue.extend(customDialog)
function 弹窗工厂(config) {
// 具体代码参考elementui弹窗源码
...
...
const Dialog = function (options) {
...
const instance = new NewDialog ({
i18n,
data
})
instance.$mount()
....
}
....
return Dialog
}
export default 弹窗工厂
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