<script>
// // 页面加载的时候触发
// window.addEventListener("load", function () {
// })
// 页面滚动条
x.style.display = "none";
window.addEventListener("scroll", function () {
if (window.pageYOffset > 70) {
x.style.display = "block";
} else {
x.style.display = "none";
};
})
// 页面尺寸发生变化触发事件
window.addEventListener("resize", function () {
console.log(window.innerHeight, window.innerWidth);
});
</script>
