fix：1、我的学习增加返回按钮

src/main/resources/views/platform/zhghh5/learning/myRecord/index.html

@@ -25,6 +25,25 @@ layout("/layouts/platform_h5.html"){
         border-radius: 50%;
         background: rgba(255, 255, 255, .08);
     }
+    .my-study-back {
+        position: absolute;
+        top: 10px;
+        left: 8px;
+        z-index: 2;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        width: 38px;
+        height: 38px;
+        border-radius: 50%;
+        padding: 0;
+        border: 0;
+        background: rgba(15, 23, 42, .22);
+        color: #ffffff;
+        font: inherit;
+        font-size: 24px;
+        cursor: pointer;
+    }
     .my-study-status {
         display: block;
         position: relative;
@@ -234,6 +253,9 @@ layout("/layouts/platform_h5.html"){
 
 <div id="app" class="my-study-page" v-cloak>
     <div class="my-study-hero">
+        <button type="button" class="my-study-back" @click="historyBack()" aria-label="返回上一页">
+            <van-icon name="arrow-left"></van-icon>
+        </button>
         <div class="my-study-status">
             <div class="my-study-time">
                 累计学习时长 <strong>{{ summary.studyHour || 0 }}</strong> 小时 <strong>{{ summary.studyMinute || 0 }}</strong> 分钟