jQuery implements the return to top function suitable for browsers that do not support js_jquery

Many websites have a return to top effect. This article explains how to use jquery to implement a return to top button.

First you need to add the following html element at the top:

<p id="back-to-top"><a href="#top" rel="external nofollow" ><span></span>返回顶部</a></p>

The a tag points to the anchor point top, which can prevent an anchor point of eceddad6cd37ce6da5a70ad5124efa065db79b134e9f6b82c0b36e0489ee08ed at the top, so that the effect of returning to the top can also be achieved when the browser does not support js. .

If you want the image returned to the top to be displayed on the right, you also need some css styles, as follows:

/*returnTop*/ 
p#back-to-top{ 
position:fixed; 
display:none; 
bottom:100px; 
right:80px; 
} 
p#back-to-top a{ 
text-align:center; 
text-decoration:none; 
color:#d1d1d1; 
display:block; 
width:64px; 
/*使用CSS3中的transition属性给跳转链接中的文字添加渐变效果*/ 
-moz-transition:color 1s; 
-webkit-transition:color 1s; 
-o-transition:color 1s; 
} 
p#back-to-top a:hover{ 
color:#979797; 
} 
p#back-to-top a span{ 
background:transparent url(/static/imgs/sprite.png?1202) no-repeat -25px -290px; 
border-radius:6px; 
display:block; 
height:64px; 
width:56px; 
margin-bottom:5px; 
/*使用CSS3中的transition属性给<span>标签背景颜色添加渐变效果*/ 
-moz-transition:background 1s; 
-webkit-transition:background 1s; 
-o-transition:background 1s; 
} 
#back-to-top a:hover span{ 
background:transparent url(/static/imgs/sprite.png&#63;1202) no-repeat -25px -290px; 
}

The background image in the above style is a sprite image. Two separate return to top images are provided below for friends to use:

With html and styles, we also need to use js to control the return to top button, which will fade in and out when the page scrolls.

<script src="http://ajax.microsoft.com/ajax/jQuery/jquery-1.7.2.min.js"></script> 
<script> 
$(function(){ 
//当滚动条的位置处于距顶部100像素以下时，跳转链接出现，否则消失 
$(function () { 
$(window).scroll(function(){ 
if ($(window).scrollTop()>100){ 
$("#back-to-top").fadeIn(1500); 
} 
else 
{ 
$("#back-to-top").fadeOut(1500); 
} 
}); 

//当点击跳转链接后，回到页面顶部位置 

$("#back-to-top").click(function(){ 
$('body,html').animate({scrollTop:0},1000); 
return false; 
}); 
}); 
}); 
</script>

That’s it.

Note that after loading the page, you need to drag the scroll bar down a little to see the rendering back to the top.