Angular2中的管道类似于命令行中的管道。前面每个值的输出在管道之后被送入过滤器，这使得链过滤器很容易，就像这样:

<template *ngFor="#item of itemsList">
    <div *ngIf="conditon(item)">{item | filter1 | filter2}</div>
</template>

简化方式(由于性能问题，仅用于小型数组。在大型数组中，你必须通过代码手动创建过滤器):

见:https://angular.io/guide/pipes appendix-no-filterpipe-or-orderbypipe

@Pipe({
    name: 'filter'
})
@Injectable()
export class FilterPipe implements PipeTransform {
    transform(items: any[], field : string, value : string): any[] {  
      if (!items) return [];
      if (!value || value.length == 0) return items;
      return items.filter(it => 
      it[field].toLowerCase().indexOf(value.toLowerCase()) !=-1);
    }
}

用法:

<li *ngFor="let it of its | filter : 'name' : 'value or variable'">{{it}}</li>

如果使用变量作为第二个参数，不要使用引号。

第一步是在组件中使用@Pipe创建Filter。ts文件:

your.component.ts

import { Component, Pipe, PipeTransform, Injectable } from '@angular/core';
import { Person} from "yourPath";

@Pipe({
  name: 'searchfilter'
})
@Injectable()
export class SearchFilterPipe implements PipeTransform {
  transform(items: Person[], value: string): any[] {
    if (!items || !value) {
      return items;
    }
    console.log("your search token = "+value);
    return items.filter(e => e.firstName.toLowerCase().includes(value.toLocaleLowerCase()));
  }
}
@Component({
  ....
    persons;

    ngOnInit() {
         //inicial persons arrays
    }
})

和Person对象的数据结构:

person.ts

export class Person{
    constructor(
        public firstName: string,
        public lastName: string
    ) { }
}

在你的html文件视图中:

your.component.html

    <input class="form-control" placeholder="Search" id="search" type="text" [(ngModel)]="searchText"/>
    <table class="table table-striped table-hover">
      <colgroup>
        <col span="1" style="width: 50%;">
        <col span="1" style="width: 50%;">
      </colgroup>
      <thead>
        <tr>
          <th>First name</th>
          <th>Last name</th>
        </tr>
      </thead>
      <tbody>
        <tr *ngFor="let person of persons | searchfilter:searchText">
          <td>{{person.firstName}}</td>
          <td>{{person.lastName}}</td>
        </tr>
      </tbody>
    </table>

基于上面提出的非常优雅的回调管道解决方案，可以通过允许传递额外的过滤器参数来进一步泛化它。然后我们有:

callback.pipe.ts

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

@Pipe({
  name: 'callback',
  pure: false
})
export class CallbackPipe implements PipeTransform {
  transform(items: any[], callback: (item: any, callbackArgs?: any[]) => boolean, callbackArgs?: any[]): any {
    if (!items || !callback) {
      return items;
    }
    return items.filter(item => callback(item, callbackArgs));
  }
}

组件

filterSomething(something: Something, filterArgs: any[]) {
  const firstArg = filterArgs[0];
  const secondArg = filterArgs[1];
  ...
  return <some condition based on something, firstArg, secondArg, etc.>;
}

html

<li *ngFor="let s of somethings | callback : filterSomething : [<whatWillBecomeFirstArg>, <whatWillBecomeSecondArg>, ...]">
  {{s.aProperty}}
</li>

理想情况下，您应该为此创建angualr 2管道。但是你可以做这个魔术。

<ng-container *ngFor="item in itemsList">
    <div*ngIf="conditon(item)">{{item}}</div>
</ng-container>

我不确定它是什么时候进来的，但他们已经做了切片管，可以做到这一点。它也有很好的记录。

https://angular.io/docs/ts/latest/api/common/index/SlicePipe-pipe.html

<p *ngFor="let feature of content?.keyFeatures | slice:1:5">
   {{ feature.description }}
</p>