export和import的使用

1、export
export var a = “123”
import {a} from ‘…/**.js’
console.log(a)

var a = ’abc‘,b = ‘efg’
export {a,b} //修改变量名 export{a as cc,b as dd}
import {a,b} from ‘…/.js’ // import {cc,dd} from '…//js’
console.log(a,b)

2、export default : 默认接口
var a = 123
export default a //不用{}
import a from ‘…/**.js’

var a = ’abc‘,b = ‘efg’
export default {
a,b
}
import *(任意名字接收对象) from '…/.js’

3、import
import “" from ‘vue’ 直接寻找依赖包文件
import "” from ‘./vue’ 同级文件下的js