安卓移动端固定在底部的按钮被软件盘顶上去的解决方案

var h = document.body.scrollHeight;
window.onresize = function(){
  if (document.body.scrollHeight < h) {
    document.getElementById(‘btn‘).style.display = ‘none‘;
  }else{
    document.getElementById(‘btn‘).style.display = ‘block‘;
  }
};