主席信箱-信箱管理：修复返回按钮失效；

src/main/resources/views/platform/zhghh5/democratic/chairmanMailbox/index.html

@@ -3,7 +3,7 @@ layout("/layouts/platform_h5.html"){
 #-->
 
 <div id="app" v-cloak>
-    <van-nav-bar title="主席信箱" fixed placeholder left-text="返回" left-arrow @click-left="history.go(-1)"></van-nav-bar>
+    <van-nav-bar title="主席信箱" fixed placeholder left-text="返回" left-arrow @click-left="backHome"></van-nav-bar>
 
     <div class="banner-section">
         <div class="banner-content">
@@ -407,6 +407,9 @@ layout("/layouts/platform_h5.html"){
             }
         },
         methods: {
+            backHome() {
+                this.$pjaxReplace('/platform/h5/home')
+            },
             goPage(url) {
                 this.$pjaxReplace(url)
             },