ionic3——数据变更后无法立即更新到UI

import { Component, NgZone } from '@angular/core';
...
constructor(
    private zone: NgZone
  ) {}
...
this.zone.run(() => {
            this.display_number = '啊啊啊啊';
          });

原地址：https://stackoverflow.com/questions/45690368/ionic-3-not-updating-view