function heightToTop(ele){
//ele为指定跳转到该位置的DOM节点
const root = document.body;
let height = 0;
do{
height += ele.offsetTop;
ele = ele.offsetParent;
}while( ele !== root )
return height;
}
元素滚动到可见区域 // var ele = document.getElementById("h3")
// window.scrollTo({
// top:heightToTop(ele),
// behavior:'smooth'
// })
// 方法2
// ele.scrollIntoView({behavior:'smooth'})
