我已经写好了代码,让它在页面滚动20px后显示出来。但使用这段代码后,按钮就不显示了。这里的问题是,当侧边栏和容器都滚动时,按钮可以正常工作。我想让它在只有右边的容器滚动的时候工作。
//go to top button
var topBtn = document.getElementById('top');
var contain = document.getElementsByClassName('container').scrollTop;
window.onscroll = function(){
scrollFunction()
};
function scrollFunction(){
if (document.contain > 20){
topBtn.style.display = 'block';
}
else{
topBtn.style.display = 'none';
}
}
function goToTop(){
document.contain = 0;
document.documentElement.scrollTop = 0;
}
topBtn.addEventListener('click', goToTop);
<div class="wrapper">
<nav role="navigation" id="nav">
<img class="profile-img" src="images/profile-photo-new.jpg" alt="" />
<a href="#about" class="nav-links">About</a>
<a href="#experience" class="nav-links">Experience</a>
<a href="#education" class="nav-links">Education</a>
<a href="#skills" class="nav-links">Skills</a>
<a href="#interests" class="nav-links">Interests</a>
<a href="#certificates" class="nav-links">Certificates</a>
</nav>
<div class="container">
<div id="about" class="mtb about-fixed-nav">
<h1 class="heading about-head">
<span>Pratit</span>
Bangdiwala
</h1>
<a href="#" id="top">Top</a>
</div>
</div>
<script src="custom.js"></script>
</body>
</html>
用这个
<a href="#nav" id="top">Top</a>
使用页面顶部元素的Id作为 "href "valueLike "nav"