.app-loading {
  width: 100vw;
  height: 100vh;
  background-color: #ffffff;
  display: flex;
  justify-content: center; /* 水平居中 */
  align-items: center;     /* 垂直居中 */
}
.app-loading .app-loading-item {
  width: 150px;
  height: 150px;

}
.app-loading .app-loading-item .app-loading-color {
  color: #FF8900;
  margin: 0 auto;
}
.app-loading .app-loading-item .app-loading-title {
  color: #FF8900;
  width: 150px;
  margin-top: 20px;
  text-align: center;
}
.app-loading .app-loading-item .app-loading-title:after{
  animation: txt 5s infinite;
  content: "";
}
@keyframes txt {
  0% {
    content: "LOADING.";
  }
  50% {
    content: "LOADING..";
  }
  100% {
    content: "LOADING...";
  }
}