typescript

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命令

安装

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npm install -g typescript

编译为js

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tsc hello.ts   //不指定名字的话生成hello.js
tsc hello.ts -w   //使用watch mode

基本类型

Number Boolean String Symbol
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let num = 1;     //不能num = "1" 已经规定了是number类型
let is = true;
let name = "name;
let count: number = 10;
let isDone: boolean = false;
let name: string = "semliker";
const sym = Symbol();
let obj = {
  [sym]: "semlinker",
};
console.log(obj[sym]); // semlinker
Array Object
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let arr = [1,2,3]    //不能arr[0] = 'a'或者arr.push('a') 
let list: number[] = [1, 2, 3];
let netja = {
  name: 'aaa',
  age: 0
}
//不能添加属性，比如netja.skills = ['x']，或者给不符合属性类型的值，比如netja.name = 1
//可以重新赋值
netja = {
  name: 'xxx',
  age: 9
}