调整浏览器自动化后端脚本，将元素操作相关函数移至新文件script.js

plugin/lib/quickcomposer/browser/index.js

@@ -1,7 +1,11 @@
 const browser = require("./browser");
+const tabs = require("./tabs");
 const getSelector = require("./getSelector");
+const script = require("./script");
 
 module.exports = {
   ...browser,
   ...getSelector,
+  ...tabs,
+  ...script,
 };