feat: 前端升级至vue3，后端代码结构重构，新增权限管理相关功能

mayfly_go_web/src/common/utils/loading.ts

@@ -0,0 +1,46 @@
+import { nextTick } from 'vue';
+import loadingCss from '@/theme/loading.scss';
+
+// 定义方法
+export const NextLoading = {
+    // 载入 css
+    setCss: () => {
+        let link = document.createElement('link');
+        link.rel = 'stylesheet';
+        link.href = loadingCss;
+        link.crossOrigin = 'anonymous';
+        document.getElementsByTagName('head')[0].appendChild(link);
+    },
+    // 创建 loading
+    start: () => {
+        const bodys: any = document.body;
+        const div = document.createElement('div');
+        div.setAttribute('class', 'loading-next');
+        const htmls = `
+			<div class="loading-next-box">
+			<div class="loading-next-box-warp">
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+				<div class="loading-next-box-item"></div>
+			</div>
+		</div>
+		`;
+        div.innerHTML = htmls;
+        bodys.insertBefore(div, bodys.childNodes[0]);
+    },
+    // 移除 loading
+    done: () => {
+        nextTick(() => {
+            setTimeout(() => {
+                const el = document.querySelector('.loading-next');
+                el && el.parentNode?.removeChild(el);
+            }, 1000);
+        });
+    },
+};