去掉bgUrl的设定

src/vendor/tianai-captcha/captcha/captcha.js

@@ -9,7 +9,6 @@ import { CaptchaConfig, wrapConfig, wrapStyle } from "./config/config";
 import { clearAllPreventDefault } from "./common/common";
 const template = `
   <div class="__captcha-parent">
-  <div class="captcha-bg-img"></div>
   <div class="captcha-box">
   <div class="captcha-loading loading"></div>
   </div>
@@ -57,7 +56,6 @@ class TianAiCaptcha {
     this.config.domBindEl.append(template);
     this.domTemplate = this.config.domBindEl.find(".__captcha-parent");
     clearAllPreventDefault(this.domTemplate);
-    this.loadStyle();
     // 绑定按钮事件
     this.config.domBindEl
       .find(".refresh-btn")
@@ -98,17 +96,6 @@ class TianAiCaptcha {
       .css("display", "none");
   }
 
-  loadStyle() {
-    // 设置样式
-    const bgUrl = this.style.bgUrl;
-    if (bgUrl) {
-      // 背景图片
-      this.config.domBindEl
-        .find(".captcha-bg-img")
-        .css("background-image", "url(" + bgUrl + ")");
-    }
-  }
-
   destroyWindow() {
     if (this.C) {
       this.C.destroy();