iphoneX 适配

body{ 
  font-size: 12px; 
  min-height:568px; 
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
  font-family:PingFangSC,Microsoft Yahei,Helvetica Neue, Helvetica, Arial, sans-serif;
  padding-top: constant(safe-area-inset-top);
  padding-top: env(safe-area-inset-top);
  padding-left: constant(safe-area-inset-left);
  padding-left: env(safe-area-inset-left);
  padding-right: constant(safe-area-inset-right);
  padding-right: env(safe-area-inset-right);
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
}

.footerhide{
  position: fixed;
  bottom: 0;
  width: 100%;
  height: constant(safe-area-inset-bottom);
  height: env(safe-area-inset-bottom);
  background: #fff;
}