# let/var/const/全局变量
let title = 'title'
var title = 'title'
const TITLE = 'Hello World'
window.title = 'My Blog'
导入在 package.json 中定义的
import Vue from 'vue'
import Router from 'vue-router'
// @代表源代码目录
import SayHi from '@/views/SayHi'
export default {
}
// lib/math.js
`
export function sum(x, y) {
return x + y
}
export var pi = 3.14
`
// app.js
import * as math from 'lib/math'
math.sum(math.pi, math.pi)
//other_app.js
import {sum, pi} from 'lib/math'
sum(pi, pi)
<script>
export default {
data() {
return {}
}
}
</script>
等价代码：
<script>
export default {
data: function() {
return {}
}
}
</script>
箭头函数
.then(res => ...);
.then(function (res) {
})
let title = 'title'
{title : title}
等价代码
{title}
