很久简单的某段 python 爬虫中的 js 代码: 
        wait_for = """js:() => {
            const click_for_more_selector = '#printInfo .project-contacts-content > div:last-child';
            const click_for_more_element = document.querySelector(click_for_more_selector);

            if (click_for_more_element) {
                window.test = click_for_more_element
                click_for_more_element.click();
  ...