意见反馈增加最大字数显示跟限制，

src/views/user/components/opinion.vue

@@ -6,8 +6,8 @@
         <div class="px-6 bg-white form">
           <div class="row flex justify-between items-start py-6">
             <div class="w-40">反馈内容</div>
-            <el-input type="textarea" resize="none" :autosize="{ minRows: 5, maxRows: 5 }" v-model="form.content"
-              placeholder="请输入内容"></el-input>
+            <el-input type="textarea" maxlength="400" resize="none" :autosize="{ minRows: 5, maxRows: 5 }" v-model="form.content"
+              placeholder="请输入内容" show-word-limit></el-input>
           </div>
           <div class="flex justify-between items-center py-6">
             <div class="w-52"></div>