例子
import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators, FormControl..., AbstractControl } from '@angular/forms';
import { concat, merge, zip, combineLatest, race } from 'rxjs.../app.component.html',
styleUrls: ['....);
// 监听整个表单
this.form.valueChanges
.subscribe( res => console.log(res));
}
}
HTML...比如这里在结果里追加上次更新时间,字段名为lastTime
this.form.valueChanges
.pipe(
filter(() => this.form.valid