ionic4 解决键盘遮挡输入框的问题

bfscrolltop; // 获取软键盘唤起前浏览器滚动部分的高度

ngOnInit(): void {
   this.bfscrolltop = document.body.scrollTop;
}

focusInput() {
    document.body.scrollTop = document.body.scrollHeight;

  }

  blurInput() {
    document.body.scrollTop = this.bfscrolltop;
  }