Fix：3853 【商城小程序】聊天窗口可输入字数太少 修改为500字

pkg_common/views/room.vue

@@ -78,7 +78,7 @@
       <view class="input-box">
         <textarea
           v-model="content"
-          maxlength="150"
+          maxlength="500"
           :auto-height="true"
           :fixed="true"
           :show-confirm-bar="false"
@@ -279,7 +279,8 @@ export default {
     },
 
     userInput(event) {
-      this.content = event.detail.value;
+      // 只取前500字
+      this.content = event.detail.value.slice(0, 500);
     },
 
     userSend(msg_type) {