first commit

public/app-loading.css

@@ -0,0 +1,45 @@
+/* 白屏阶段会执行的 CSS 加载动画 */
+
+#app-loading {
+  position: relative;
+  top: 45vh;
+  margin: 0 auto;
+  color: #409eff;
+  font-size: 12px;
+}
+
+#app-loading,
+#app-loading::before,
+#app-loading::after {
+  width: 2em;
+  height: 2em;
+  border-radius: 50%;
+  animation: 2s ease-in-out infinite app-loading-animation;
+}
+
+#app-loading::before,
+#app-loading::after {
+  content: "";
+  position: absolute;
+}
+
+#app-loading::before {
+  left: -4em;
+  animation-delay: -0.2s;
+}
+
+#app-loading::after {
+  left: 4em;
+  animation-delay: 0.2s;
+}
+
+@keyframes app-loading-animation {
+  0%,
+  80%,
+  100% {
+    box-shadow: 0 2em 0 -2em;
+  }
+  40% {
+    box-shadow: 0 2em 0 0;
+  }
+}

public/detect-ie.js

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+// Tip: Simple judgments may not fully cover
+if (/MSIE\s|Trident\//.test(navigator.userAgent)) {
+  document.body.innerHTML = "<strong>Sorry, this browser is currently not supported. We recommend using the latest version of a modern browser. For example, Chrome/Firefox/Edge.</strong>"
+}