isElementInViewport(el) {
// 获取元素是否在可视区域
var rect = el.getBoundingClientRect();
return (
rect.top >= 0 &&
rect.left >= 0 &&
rect.bottom <=
(window.innerHeight || document.documentElement.clientHeight) &&
rect.right <=
(window.innerWidth || document.documentElement.clientWidth)
);
},
// 应用
const keyDiv = document.getElementById("xxxld");
this.isElementInViewport(keyDiv)