Ionic3实现选项卡切换并重新加载echarts的方法

<ion-header>
 <ion-navbar>
  <ion-title>区域</ion-title>
 </ion-navbar>

</ion-header>

<ion-content padding>

  <ion-segment [(ngModel)]="choice" (ionChange)="segmentChanged($event)">
   <ion-segment-button value="choice1">
    省份增速排名
   </ion-segment-button>
   <ion-segment-button value="choice2">
    市州增速排名
   </ion-segment-button>
   <ion-segment-button value="choice3">
    全省走势
   </ion-segment-button>
   <ion-segment-button value="choice4">
    市州占比
   </ion-segment-button>
  </ion-segment>

  <div id="chartContainer" ></div>

</ion-content>

import {Component} from '@angular/core';
import * as echarts from 'echarts';

@Component({
 selector: 'page-data-area',
 templateUrl: 'area.html'
})
export class DataAreaPage {
 choice: string = "choice1";
 ec: any = echarts;
 chartContainer: any;

 constructor() {
 }

 clickChart1() {
  const chart1 = this.ec.init(this.chartContainer);
  chart1.setOption({
   series: {
    type: 'pie',
    data: [{
     name: 'A',
     value: 10
    }, {
     name: 'B',
     value: 20
    }, {
     name: 'C',
     value: 30
    }, {
     name: 'D',
     value: 40
    }]
   }
  }, true);
  this.chartContainer.removeAttribute("_echarts_instance_");
 }

 clickChart2() {
  const chart2 = this.ec.init(this.chartContainer);
  chart2.setOption({
   series: {
    type: 'pie',
    data: [{
     name: 'A',
     value: 10
    }, {
     name: 'B',
     value: 20
    }, {
     name: 'C',
     value: 30
    }]
   }
  }, true);
  this.chartContainer.removeAttribute("_echarts_instance_");
 }

 clickChart3() {
  const chart3 = this.ec.init(this.chartContainer);
  chart3.setOption({
   series: {
    type: 'pie',
    data: [{
     name: 'A',
     value: 10
    }, {
     name: 'B',
     value: 20
    }, {
     name: 'C',
     value: 30
    }, {
     name: 'D',
     value: 40
    }, {
     name: 'E',
     value: 50
    }]
   }
  }, true);
  this.chartContainer.removeAttribute("_echarts_instance_");
 }

 clickChart4() {
  const chart4 = this.ec.init(this.chartContainer);
  chart4.setOption({
   series: {
    type: 'pie',
    data: [{
     name: 'A',
     value: 10
    }, {
     name: 'B',
     value: 20
    }, {
     name: 'C',
     value: 30
    }, {
     name: 'D',
     value: 40
    }, {
     name: 'E',
     value: 50
    }, {
     name: 'F',
     value: 60
    }]
   }
  }, true);
  this.chartContainer.removeAttribute("_echarts_instance_");
 }

 segmentChanged(e) {
  if (e.value == "choice1") {
   this.clickChart1();
  } else if (e.value == "choice2") {
   this.clickChart2();
  } else if (e.value == "choice3") {
   this.clickChart3();
  } else if (e.value == "choice4") {
   this.clickChart4();
  }
 }

 ionViewDidEnter() {
  this.chartContainer = document.getElementById('chartContainer');
  this.clickChart1();
 }

}