首先安装ion-multi-picker插件

输入命令：npm install ion-multi-picker --save

在app.module.ts中引入插件

import { MultiPickerModule } from 'ion-multi-picker';@NgModule({
imports: […………MultiPickerModule,…………
],
})

在某个页面使用时引入ion-multi-picker

import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { EceiingPage } from './eceiing';
import {MultiPickerModule} from 'ion-multi-picker';@NgModule({declarations: [EceiingPage,],imports: [MultiPickerModule,IonicPageModule.forChild(EceiingPage),],
})
export class EceiingPageModule {}//EceiingPage页面中引入插件

在eceiing.html页面中调用插件

<ion-multi-picker item-content [multiPickerColumns]="dependentColumns" [cancelText]="'取消'" [doneText]="'完成'"></ion-multi-picker>

 eceiing.ts中定义变量dependentColumns

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams,AlertController } from 'ionic-angular';
/*** Generated class for the EceiingPage page.** See https://ionicframework.com/docs/components/#navigation for more info on* Ionic pages and navigation.*/@IonicPage()
@Component({selector: 'page-eceiing',templateUrl: 'eceiing.html',
})
export class EceiingPage {public dependentColumns:any;constructor(public navCtrl: NavController,public navParams: NavParams,public alertCtrl: AlertController,){this.dependentColumns=太长了，没有复制ionViewDidEnter(){}}

省市区json的下载地址：https://raw.githubusercontent.com/raychenfj/ion-multi-picker/master/example/src/assets/chinese-cities.json

这样就可以实现三级联动城市的选择了