ionic踩过的一些坑

//进入隐藏Tab
ngOnInit() {
    let elements = document.querySelectorAll(".tabbar");
    if (elements != null) {
      Object.keys(elements).map((key) => {
        elements[key].style.display = ‘none‘;
      });
    }
  }

//返回至主界面显示Tab
ngOnDestroy() {
    let elements = document.querySelectorAll(".tabbar");
    if (elements != null) {
      Object.keys(elements).map((key) => {
        elements[key].style.display = ‘flex‘;
      });
    }
  }