import { Pipe, PipeTransform } from '@angular/core';

@Pipe({

  name: 'multi'

})

export class MultiPipe implements PipeTransform {

  transform(value: any, args?: any): any {

    if (args == null) {

      args = ;

    }

    return value * args;

  }

}

<div>我的生日{{birth | date | uppercase}}</div>

<div>我的生日{{birth | date :'yyyy-MM-dd'}}</div>

<div>我的生日{{numberA | number :'2.1-4'}}</div>

<div>我的生日{{numberA | multi :}}</div>

import { Component, OnInit } from '@angular/core';

@Component({

  selector: 'app-bind',

  templateUrl: './bind.component.html',

  styleUrls: ['./bind.component.css']

})

export class BindComponent implements OnInit {

  private birth: Date;

  private numberA: number;

  constructor() { }

  ngOnInit() {

    this.birth = new Date();

    this.numberA = 3.1514926;

  }

}