有意思的pipe对于DecimalPipe小数位保留

{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}

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

@Component({
    selector: 'number-pipe',
    template: `<div>
      <!--output '2.718'-->
      <p>e (no formatting): {{e | number}}</p>

      <!--output '002.71828'-->
      <p>e (3.1-5): {{e | number:'3.1-5'}}</p>

      <!--output '0,002.71828'-->
      <p>e (4.5-5): {{e | number:'4.5-5'}}</p>

      <!--output '0 002,71828'-->
      <p>e (french): {{e | number:'4.5-5':'fr'}}</p>

      <!--output '3.14'-->
      <p>pi (no formatting): {{pi | number}}</p>

      <!--output '003.14'-->
      <p>pi (3.1-5): {{pi | number:'3.1-5'}}</p>

      <!--output '003.14000'-->
      <p>pi (3.5-5): {{pi | number:'3.5-5'}}</p>
      <p>zero (1.2-2): {{zero | number:'1.2-2'}}</p>
      <p>zero (1.2-2): {{'' | number:'1.2-2'}}</p>
    </div>`
  })
  export class NumberPipeComponent {
    pi: number = 3.14;
    e: number = 2.718281828459045;
    zero: number = 0;
  }