h5浏览器判断手机软键盘弹起和收缩

判断h5浏览器中，软件盘的弹起和收缩

以下具体代码：

function isKeyboardUpFunc () {
  var u = navigator.userAgent
  var isAnd = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1
  var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)
  var isSafari = u.indexOf('Safari') > -1
  var _that = this
  if (isAnd) {
    var oh = document.documentElement.clientHeight || document.body.clientHeight
    window.addEventListener('resize', function () {
      var rh = document.documentElement.clientHeight || document.body.clientHeight // 变化之后的高度
      if (rh !== oh) {
        // 软键盘弹出
        _that.isKeyboardUp = true
      } else {
        // 软键盘收起
        _that.isKeyboardUp = false
      }
    })
  }
  if (isIOS && isSafari) {
    document.body.addEventListener('focusin', function () {
      // 软键盘弹出
      _that.isKeyboardUp = true
    })
    document.body.addEventListener('focusout', function () {
      // 软键盘收起
      _that.isKeyboardUp = false
    })
  }
}