ljh0302的专栏

转载地址：https://medium.com/front-end-hacking/callbacks-promises-and-async-await-ad4756e01d90Callbacks, Promises and Async/AwaitThis is my attempt to explain how to use asynchronous code in Javascri...

需求：邮箱验证、密码验证、用户名验证、IP地址验证、手机号验证等方案：1、键值的形式控制：this.formGroup = new FormGroup({username: new FormControl('', [Validators.requried, Validators.pattern('…')]),password: new FormControl('',),em...