[html+js]实现⾸次进⼊界⾯显⽰欢迎语定时隐藏标签html代码
<div id="hello">
<h1>Hello</h1>
</div>
<div id="mian">
<header id="header">
<!--登陆导航栏-->
<nav id="hd_nav">
<ul>
<li><a  href="./portal.html">门户</a></li>
<li><a href="#">设置主页</a></li>
<li class="skin"><a href="#">收藏⽹站</a></li>
<li class="login"><img src="i2.hdslb/bfs/face/a41e42c3e0007284dc0a8a71554f92611e9dbaa0.jpg@87w_88h_1c_100q.webp"class="avat ar"/><a class="a1"href="./login.html">登陆</a><a class="a2"href="./login.html">注册</a></li>
</ul>
</nav>
</header>
<!--导航栏end-->
<!--版权声明-->
<div id="footer">
<p>Copyright © 2020-2020 ⿊猫'vlog, All rights reserved.<br />
2020-2020，版权所有⿊猫</p>
</div>
</div>
css样式代码
*{
margin: 0;
padding: 0;
font-family:"Lantinghei SC", "Microsoft Yahei", 宋体, Arial, Helvetica, sans-serif;
font-size: 12px;
font-style: normal;
}
#mian{
display: none;
}
/*背景设置*/
body{
font-family: arial, sans-serif;
background-image:linear-gradient(125deg, #2c3e50, #27ae60, #2980b9, #e74c3c, #8e44ad);
background-size: 400%;
animation: bganimation 15s infinite;
}
@keyframes bganimation{
0%{
background-position: 0% 50%;
}
50%{
background-position: 100% 50%;
}
100%{
background-position: 0% 50%;
}
}
/*登陆导航栏*/
/*登陆导航栏*/
#header{
height: 31;
min-width: 100%;
width: 100%;
padding: 9px 10px 0 0;
position: relative;
}
#hd_nav{
float: right;
}
ul{
list-style: none;
}
#hd_nav li{
border-right: 1px solid rgba(225, 225, 225, 0.2); float: left;
height: 14px;
padding: 0 10px;
}
a{
text-decoration: none;
cursor: pointer;
}
#hd_nav .skin a{
padding-left: 22px;
position: relative;
}
#hd_nav a{
color: #fff;
height: 14px;
line-height: 14px;
}
a:hover{
text-decoration: underline;
}
.login{
padding-left: 14px;
position: relative;
}
.avatar{
border-radius: 18px;
box-shadow: 0 1px 5px rgba(87, 87, 87, 0.5); height: 20px;
left: 10px;
position: absolute;
top: -2px;
width: 20px;
}
.a1{
margin-left: 30px;
}
.a2{
margin-left: 3px;
}
/*版权声明*/
#footer{
width: 100%;
height: 68px;
float: inherit;
line-height: 26px;
color: #fff;
text-align: center;
padding-top: 50%;
}
/*设置第⼀次显⽰的画⾯*/
/*设置第⼀次显⽰的画⾯*/
#hello h1{
font-size: 300px;
text-transform: uppercase;
font-weight: 900;
letter-spacing: 10px;
position: absolute;
top: 50%;
left: 50%;
transform:translate(-50%, -50%);
margin: 0;
background:url("dwz.date/beNM") 50% 50%;
background-size: cover;
-webkit-text-fill-color: transparent;
-
webkit-background-clip: text;
background-clip: text;
}
JS代码
//开启界⾯时调⽤
js导航栏下拉菜单
/*alert("功能仅实现⾸页，登录注册");*/
if(window.name ==""){
/*    alert("⾸次进⼊");*/
window.setTimeout("init();",2000);
window.name ="isReload";// 在⾸次进⼊页⾯时我们可以给window.name设置⼀个固定值}else if(window.name =="isReload"){
/*alert("页⾯刷新");*/
//让整体界⾯显⽰出来
var test = ElementById("mian");
test.setAttribute("style","display: inline;");
//隐藏欢迎界⾯
var text = ElementById("hello");
text.setAttribute("style","display: none;");
}
}
function init(){
//让整体界⾯显⽰出来
var test = ElementById("mian");
test.setAttribute("style","display: inline;");
//隐藏欢迎界⾯
var text = ElementById("hello");
text.setAttribute("style","display: none;");
}

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