[英]How to import methods from external file that also use "this" in a Vue application
I have a vue file that has quite a few methods that I am looking to export into a separate file.我有一个 vue 文件,其中有很多方法,我希望将这些方法导出到一个单独的文件中。 The problem is some of these methods make use of the
this
keyword, and I can't figure out how to import these methods properly.问题是其中一些方法使用了
this
关键字,我不知道如何正确导入这些方法。 Here is a minimal example这是一个最小的例子
App.vue App.vue
export default {
...,
data () {
return { // assume these get generated properly through the app
this.orderAmount = null,
this.tax = null,
this.totalAmount = null
}
},
methods: {
assignForAccount () {
this.totalAmount = this.tax * this.totalAmount
}
}
}
I would like to move methods such as assignForAccount
to a separate file called methods.js
, but it I am getting undefined
errors when I try to do this:我想将诸如
assignForAccount
之类的方法移动到一个名为methods.js
的单独文件中,但是当我尝试这样做时出现undefined
的错误:
App.vue App.vue
import { assignForAccount } from './methods.js'
export default {
...,
data () {
return { // assume these get generated properly through the app
this.orderAmount = null,
this.tax = null,
this.totalAmount = null
}
},
methods: {
assignForAccount
}
}
methods.js方法.js
export const assignForAccount = (context) => {
context.totalAmount = context.tax * context.orderAmount
}
TIA TIA
You have to pass both this.tax
and this.totalAmount
from App.vue file into method.js file for the calculations.您必须将
this.tax
和this.totalAmount
从 App.vue 文件传递到 method.js 文件中进行计算。
method.js :方法.js :
export function assignForAccount = (tax, totalAmount) => {
return tax * totalAmount
}
App.vue :应用程序.vue :
import { assignForAccount } from './methods.js'
methods: {
this.totalAmount = assignForAccount(this.tax, this.totalAmount);
}
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