如何使用 javascript(无 jQuery)动画滚动到页面顶部?
How to animate scrolling to top of page using javascript (no jQuery)?
我想在按下按钮让网页缓慢滚动回页面顶部时执行转换。我知道如何使用 class 中的更改执行转换,但在这种情况下,我该怎么做?
document.documentElement.scrollTop = 0;
您可以使用以下代码移动页面顶部。
// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {
scrollFunction()
};
function scrollFunction() {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
// When the user clicks on the button, scroll to the top of the document
function topFunction() {
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}
body {
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
background: #ffffff;
}
#myBtn {
display: none;
position: fixed;
bottom: 20px;
right: 30px;
z-index: 99;
background-color: red;
color: white;
cursor: pointer;
padding: 15px;
border-radius: 4px;
}
#myBtn:hover {
background-color: #555;
}
<button onclick="topFunction()" id="myBtn" title="Go to top">Top</button>
<div style="padding:30px">Scroll Down</div>
<div style="padding:30px 30px 700px">This example demonstrates how to create a "scroll to top" button that becomes visible when the user starts to scroll the page.</div>
document.body.scrollIntoView({behavior: 'smooth', block: 'start'});
也适用于任何其他 DOM 元素。也适用于水平滚动。
我想在按下按钮让网页缓慢滚动回页面顶部时执行转换。我知道如何使用 class 中的更改执行转换,但在这种情况下,我该怎么做?
document.documentElement.scrollTop = 0;
您可以使用以下代码移动页面顶部。
// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {
scrollFunction()
};
function scrollFunction() {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
// When the user clicks on the button, scroll to the top of the document
function topFunction() {
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}
body {
font-family: Arial, Helvetica, sans-serif;
font-size: 20px;
background: #ffffff;
}
#myBtn {
display: none;
position: fixed;
bottom: 20px;
right: 30px;
z-index: 99;
background-color: red;
color: white;
cursor: pointer;
padding: 15px;
border-radius: 4px;
}
#myBtn:hover {
background-color: #555;
}
<button onclick="topFunction()" id="myBtn" title="Go to top">Top</button>
<div style="padding:30px">Scroll Down</div>
<div style="padding:30px 30px 700px">This example demonstrates how to create a "scroll to top" button that becomes visible when the user starts to scroll the page.</div>
document.body.scrollIntoView({behavior: 'smooth', block: 'start'});
也适用于任何其他 DOM 元素。也适用于水平滚动。