typescript入门之：对象属性约束

示例：使用{useName:string, password:number}约束传入的userData参数（并将password置为可选参数）

class User{ useName:string; password?:number|undefined; //使用{useName:string, password?:number|undefined}约束传入的userData参数 constructor(userData:{useName:string, password?:number|undefined}){ this.useName=userData.useName; if(userData.password) this.password=userData.password; } } let u1=new User( {useName:"小猪猪", password:12233} ); let u2=new User( {useName:"大猪猪"} ) console.log(u1); console.log(u2);

输出结果：