js消息提示特效

<div id="toast" class="toast">这是一个消息提示！</div>

.toast {
  visibility: hidden; /* 默认隐藏 */
  min-width: 250px;
  margin-left: -125px;
  background-color: #333;
  color: #fff;
  text-align: center;
  border-radius: 2px;
  padding: 16px;
  position: fixed;
  z-index: 1;
  left: 50%;
  bottom: 30px;
  font-size: 17px;
}

.toast.show {
  visibility: visible;
  -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
  animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

@-webkit-keyframes fadein {
  from {bottom: 0; opacity: 0;}
  to {bottom: 30px; opacity: 1;}
}

@keyframes fadein {
  from {bottom: 0; opacity: 0;}
  to {bottom: 30px; opacity: 1;}
}

@-webkit-keyframes fadeout {
  from {bottom: 30px; opacity: 1;}
  to {bottom: 0; opacity: 0;}
}

@keyframes fadeout {
  from {bottom: 30px; opacity: 1;}
  to {bottom: 0; opacity: 0;}
}

function showToast(message) {
  var toast = document.getElementById("toast");
  toast.textContent = message;
  toast.className = "toast show";

  setTimeout(function(){ 
    toast.className = toast.className.replace("show", "");
  }, 3000);
}

// 调用示例
showToast("操作成功！");