ios12.x等低版本系统输入框(input/textarea)拉起键盘后无法收回

NO BB , SHOW ME CODE!

objBlurFun("input");

//如果不是当前触摸点不在input上, 那么都失去焦点
function objBlurFun(el, time){
  const TIME = time || 300;
  //判断是否为苹果
  const ISIPHONE = navigator.userAgent.toUpperCase().indexOf("IPHONE") != -1;
  if(ISIPHONE){
    let obj = document.querySelectorAll(el);
    for(let i=0; i<obj.length; i++){
      objBlur(obj[i], TIME);
    }
  }
}  

// 元素失去焦点隐藏iphone系统软键盘
function objBlur(el, time){
  if(el){
    el.addEventListener("focus", function(){
      document.addEventListener("touchend", docTouchend, false);
    }, false);
  }else{
    throw new Error("objBlur()没有找到元素");
  }
  
  let docTouchend = function(event){
    if(event.target != el){
      setTimeout(() => {
        el.blur();
        document.removeEventListener('touchend', docTouchend, false);
      }, time);
    }
  };
}