querySelectorAll() 的用法

1.改变样式

let dom = document.querySelectorAll('.waListHeight  .ant-table-body');
dom[0].style.height ='100px';

let dom = document.querySelectorAll('.waListHeight');
dom[0].style.height ='100px';

2.给元素添加类名
document.querySelector("html").classList.add("noscroll");

3.给元素删除类

document.querySelector("html").classList.remove("noscroll");