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// 概览
const myElement = document.getElementById('navigation');
const header = document.getElementsByTagName('header');
const elements = document.getElementsByClassName('anchorLocation');
const dwEles = document.getElementsByClassName('dw1');
const elementsArray = Array.from(elements);
const dwElesArray = Array.from(dwEles);
(function() {
let activeKey = 0;
window.addEventListener('scroll', function () {
var scrollTop = window.pageYOffset || document.documentElement.scrollTop; // 获取页面滚动距离
if (scrollTop >= window.innerHeight * 0.75) {
myElement.style.position = 'fixed'; // 如果子元素滑到最顶部，则设置为固定定位
myElement.style.top = '0';
if(header[0]) {
header[0]['style']['display'] = 'none';
}
} else {
myElement.style.position = ''; // 否则，清空定位属性，使元素回到相对定位（默认值）
if(header[0]) {
header[0]['style']['display'] = 'block';
}
}
// 锚点定位高亮
elementsArray.forEach((item, index) => {
if (scrollTop + myElement.offsetHeight >= item.offsetTop) {
activeKey = index;
}
});
dwElesArray.forEach((ele,index) => {
const a = ele.querySelector('a');
if (index == activeKey) a.classList.add('navTitle');
else a.classList.remove('navTitle');
});
});
}) ();
// 锚点定位
function anchorLocation(e,key) {
const targetElement = elementsArray[key];
targetElement.scrollIntoView({
behavior: 'smooth',
block: 'start' // Align to the top of the viewport
});
}