解决Angular报错 Can't bind to 'ngModel' since it isn't a known property of 'input'

在input中使用[ngModel]报错：Can't bind to 'ngModel' since it isn't a known property of 'input'

解决办法：在module.ts中添加import和providers

import { NgModule } from '@angular/core';

import { FormsModule } from '@angular/forms';