1.重构全局页面结构，从之前每个页面独立绘制改为路由嵌套

2.全局页面样式优化，如滚动条、标题栏等

web_src/src/layout/index.vue

@@ -0,0 +1,90 @@
+<template>
+  <el-container style="height: 100%">
+    <el-header>
+      <ui-header/>
+    </el-header>
+    <el-main>
+      <el-container>
+        <transition name="fade">
+          <router-view></router-view>
+        </transition>
+      </el-container>
+    </el-main>
+  </el-container>
+</template>
+
+<script>
+import uiHeader from "./UiHeader.vue";
+
+export default {
+  name: "index",
+  components: {
+    uiHeader
+  },
+}
+</script>
+<style>
+/*定义滚动条高宽及背景 高宽分别对应横竖滚动条的尺寸*/
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+/*定义滚动条轨道 内阴影+圆角*/
+::-webkit-scrollbar-track {
+  border-radius: 4px;
+  background-color: #F5F5F5;
+}
+
+/*定义滑块 内阴影+圆角*/
+::-webkit-scrollbar-thumb {
+  border-radius: 4px;
+  background-color: #c8c8c8;
+  box-shadow: inset 0 0 6px rgba(0, 0, 0, .1);
+  -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, .1);
+}
+
+/*定义标题栏*/
+.page-header {
+  background-color: #FFFFFF;
+  margin-bottom: 1rem;
+  padding: 0.5rem;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.page-title {
+  font-weight: bold;
+  text-align: left;
+}
+
+.page-header-btn {
+  text-align: right;
+}
+</style>
+<style scoped>
+.el-main {
+  margin: 0;
+}
+
+.fade-enter {
+  visibility: hidden;
+  opacity: 0;
+}
+
+.fade-leave-to {
+  display: none;
+}
+
+.fade-enter-active,
+.fade-leave-active {
+  transition: opacity .5s ease;
+}
+
+.fade-enter-to,
+.fade-leave {
+  visibility: visible;
+  opacity: 1;
+}
+</style>