jsに大きな問題があります&は非常に悪いです。jsスタイルを変更するDOM要素 - なぜこのコードは悪いですか?
なぜこのコードが正常に動作しますか?
(これはトップBTNに戻って)
function checkScrollTop(){
if (document.body.scrollTop > 300) {
document.getElementById("backToTop").style.display = "block";
setTimeout(function() {
document.getElementById("backToTop").style.opacity = 1;
}, 1);
}else {
document.getElementById("backToTop").style.opacity = "";
setTimeout(function() {
document.getElementById("backToTop").style.display = "";
}, 300);
}
}
function backToTop(){
var x = setInterval(function() {
if (document.body.scrollTop != 0) {
document.body.scrollTop -=20;
}else {
clearInterval(x);
}
}, 1);
}
#backToTop{
display: none;
opacity: 0;
position: fixed;
bottom: 20px;
right: 20px;
transition: 0.3s;
cursor: pointer;
background-color: #098774;
color: white;
text-align: center;
font-size: 50px;
width: 50px;
height: 50px;
border-radius: 50%;
}
<html>
<body onscroll="checkScrollTop();">
<div id="backToTop" onclick="backToTop();">^</div>
<div style="width: 300px;">
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://stackoverflow.com/ads/community?id=so_community_div Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER
http://clc.stackoverflow.com/markup.js?omni=Au0GHyu2P9QIOw2VALkFPwACAAAAAgA…XJlZ2lzdGVyZWR8eC1wZXJzb25hLWZyb250ZW5kfAB8cwIR0hDY2RqW&lw=1959&zc=25&pf=9 Failed to load resource: net::ERR_BLOCKED_BY_ADBLOCKER</div>
</body>
<html>
ビュー次のビデオ
[URL = http://vip.opload.ir/vipdl/95/10/hamidr.bk/avc-Video-1-18-2017-7-11-11-PM.mp4] http://vip.opload.ir/vipdl/95/10/hamidr.bk/avc-Video-1-18-2017-7-11-11-PM.mp4 [/ URL]
_jsは大きな問題を抱えていると、本当にとてもbad_です!なぜそれを使うのですか? –
だから私は魔女の1つの言語を使用してプログラムの変更domの?? – hamidreza
jsはとてもクールです。その栄光をすべて得るためには、それを正しく学ぶ必要があります。 –