text: export default function call(functionName, args) {
      if ('function' === typeof functionName) {
          return functionName.apply(this, args);
      }
      else if ('string' === typeof functionName) {
          let name = functionName;
          if ('()' === name.substring(name.length - 2)) {
              name = name.substring(0, name.length - 2);
          }
          const ns = name.split('.');
          const func = ns.pop();
          let context = window;
          for (const t of ns) {
              context = context[t];
          }
          return (typeof context[func] === 'undefined') ? null : context[func].apply(this, args);
      }
  }
  