Merge branch 'dev-header-20200325' into 'release'

协议管理头部系统切换优化 code reviewer：杨广俊



See merge request !2

src/views/layout/header.vue

@@ -22,7 +22,7 @@
                 <span class="el-dropdown-link">
                     {{'系统切换'}}<i class="el-icon-arrow-down el-icon--right"></i>
                 </span>
-                <el-dropdown-menu slot="dropdown">
+                <el-dropdown-menu slot="dropdown" class="nav-dropdown">
                     <el-dropdown-item v-for="item in systemInfoList" :key="item.id">
                         <span class="menu-item" @click="forward(item)">{{item.systemName}}</span>
                     </el-dropdown-item>
@@ -223,10 +223,17 @@ export default {
     text-align: center;
 }
 
+.nav-dropdown{
+  .el-dropdown-menu__item{
+    padding: 0;
+  }
+}
 .menu-item {
-    font-size: 14px;
-    font-weight: 300;
-    color: #606266;
+  display: block;
+  font-size: 14px;
+  font-weight: 300;
+  color: #606266;
+  padding: 0 20px;
 }
 </style>