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148 lines
1.2 KiB
148 lines
1.2 KiB
# 基础语法
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### 基础数据类型的定义
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```tsx
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//字符串类型
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let title: string = '急急急'
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//number
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let age: number = 18
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//boolean
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let isLogin: boolean = true
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//常量
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const PI: number = 3.1415926
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```
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### 数组
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```tsx
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let names: string[] = ['jack','li','wang']
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```
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### 函数
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```tsx
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function 函数名(形参:类型){
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函数体
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return
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}
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//箭头函数
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let 函数名 = () =>{
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//函数体
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}
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```
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### 对象
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```tsx
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//定义对象并使用
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//1. 定义接口
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interface Person{
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name: string
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age: number
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weight: number
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dance: (i: number) =>{
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console.log('ming跳了',i,'次舞')
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}
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}
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//基于接口，定义对象
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let ym: Person = {
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name: 'ming',
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age: 18,
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weight: 90
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}
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//获取对象属性值 对象名.属性名
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console.log('体重：',ym.weight)
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```
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### 联合类型
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```tsx
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let judge: number|string = 100
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judge = 'A'
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```
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### 枚举
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```tex
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//约定变量只能在一组数据范围中选择值
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enum ThemeColor{
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Red = '#ffof29'
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Orange = '#ff7100'
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Green = '#30b30e'
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}
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//引用后color只能在ThemeColor中取值
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let color: ThemeColor = ThemeColor.Red
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```
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