TypeScript 的核心优势
TypeScript 是 JavaScript 的超集，通过静态类型检查增强了代码的可靠性。类型系统能在编译阶段捕获潜在错误，减少运行时异常。
基础类型注解
变量声明时可直接标注类型：
let username: string = "Alice"; let age: number = 30; let isActive: boolean = true;数组和元组类型：
let numbers: number[] = [1, 2, 3]; let tuple: [string, number] = ["text", 42];接口与类型别名
接口定义对象结构：
interface User { id: number; name: string; email?: string; // 可选属性 }类型别名支持更复杂的类型组合：
type Point = { x: number; y: number; }; type ID = string | number;函数类型约束
参数和返回值类型标注：
function greet(name: string): string { return `Hello, ${name}`; }箭头函数类型：
const add: (x: number, y: number) => number = (x, y) => x + y;泛型应用
创建可复用的类型组件：
function identity<T>(arg: T): T { return arg; }泛型约束示例：
interface Lengthwise { length: number; } function loggingIdentity<T extends Lengthwise>(arg: T): T { console.log(arg.length); return arg; }类型推断与断言
自动类型推断：
let inferredString = "text"; // 自动推断为string类型类型断言语法：
let someValue: any = "this is a string"; let strLength: number = (someValue as string).length;高级类型技巧
联合类型与交叉类型：
type Admin = User & { privileges: string[] };索引签名处理动态属性：
interface StringArray { [index: number]: string; }编译配置
tsconfig.json 关键配置项：
{ "compilerOptions": { "target": "ES6", "strict": true, "module": "commonjs" } }类型声明文件
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为第三方库添加类型支持：
declare module 'untyped-lib' { export function doSomething(): void; }
