在 Ionic 3 中,我如何添加迄今为止的天数?

In Ionic 3 how can i add number of days to date?

  ionViewDidEnter() {
    let self = this;
    self.originationsProvider.getOrigination()
      .then((data) => {

        self.origination = data;
        console.log(self.origination, "slefOrigination");
        this.complete = self.origination.filter((obj) => obj.state_status == 'completed');
        this.inComplete = self.origination.filter((obj) => obj.state_status == 'not_completed');
  
  // i am getting Change_Date from self.origination json
        console.log(this.inComplete, this.complete, "Incomplete");
        self.servicing = data;

        self.cdr.detectChanges();
      })
  }
                    <p style="white-space: initial;font-size: 15px;color: #3f454e;">Proxy payment due by: “No Later than {{account.Change_Date}}”</p>
  
  //I am getting date in Change_Date.I have to display the date by adding 9 days to it.

我想在今天的日期基础上加 9 天。我提前使用 Angular 4 & Ionic 3.Thanks

var today = new Date();

添加 9 天到日期

var nextdate = new Date(today.getFullYear(),today.getMonth(),today.getDate()+9);