How to achieve the effect of returning to the top of a web page through JS/CSS
This article is about how to achieve the top effect of a web page through JS/CSS. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.
CSS button style:
# myBtn {
Display: none; / * hidden by default * /
Position: fixed
Bottom: 20px
Right: 30px
Z-index: 99
Border: none
Outline: none
Background-color: red; / * set the background color, you can set the color or picture you want * /
Color: white; / * text color * /
Cursor: pointer
Padding: 15px
Border-radius: 10px; / * fillet * /
}
# myBtn:hover {
Background-color: # 555
}
JS Code:
/ / when the web page slides down, 20px appears the "return to the top" button
_ window.onscroll = function () {scrollFunction ()}
Function scrollFunction () {console.log (121)
If (document.body.scrollTop > 20 | | document.documentElement.scrollTop > 20) {
Document.getElementById ("myBtn") .style.display = "block"
} else {
Document.getElementById ("myBtn") .style.display = "none"
}
}
/ / Click the button to return to the top
Function topFunction () {
Document.body.scrollTop = 0
Document.documentElement.scrollTop = 0
}
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