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原生js实现吸顶导航和回到顶部特效

2016-05-07 00:43 696 查看
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>吸顶导航特效</title>
<style type="text/css">
body{
margin: 0;
padding: 0;
}
.main{
width: 100%;
background: #ccc;
margin: 10px auto 0;
position: relative;
}
.content{
width: 100%;
height: 400px;
background: #0FF2D8;
margin: 10px auto 0;
line-height: 400px;

}
.navigation{
width: 100%;
height: 40px;
background: #E589B4;
margin:  auto 0;
top: 400px;
left: 0;
position: absolute;
}
.tab{
width: 180px;
height: 40px;
background: #DB3179;
float: left;
margin-left: 5px;
line-height: 40px;
text-align: center;
}
#div1{
width: 100px;
height: 100px;
background: green;
position: fixed;
bottom: 0;
right: 0;
display: none;
line-height: 100px;
text-align: center;

}
</style>
<script type="text/javascript">
window.onload = function(){
var navigaOffsetTop = 0;
function my_getElementsByClassName(class_name){
var arr = [];
elements = document.getElementsByTagName('*');
for (var i = 0; i < elements.length; i++) {
if(elements[i].className == class_name){
arr[arr.length] = elements[i];

}
}
return arr;
}
//导航条悬停在顶部
function navigaStayTop(){
var navigationBar = [];
if(document.getElementsByClassName){
navigationBar = document.getElementsByClassName('navigation');
}else{
//非标准IE下
navigationBar = my_getElementsByClassName('navigation');
}
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
if (scrollTop > navigaOffsetTop){
navigationBar[0].style.top = scrollTop + "px";
} else{
navigationBar[0].style.top = navigaOffsetTop + "px";
}
}
//给导航条上七个tab加上点击事件
var tabs = [];
if(document.getElementsByClassName){
tabs = document.getElementsByClassName('tab');
}else{
tabs = my_getElementsByClassName("tab");
}

var contents = [];
if (document.getElementsByClassName) {
contents = document.getElementsByClassName('content');

} else{
//Ie
contents = my_getElementsByClassName('content');
};
tabs[0].onclick=function(){
window.scrollTo(0, contents[2].offsetTop);
}
tabs[1].onclick=function(){
window.scrollTo(0, contents[3].offsetTop);
}
tabs[2].onclick=function(){
window.scrollTo(0, contents[4].offsetTop);
}
tabs[3].onclick=function(){
window.scrollTo(0, contents[5].offsetTop);
}
tabs[4].onclick=function(){
window.scrollTo(0, contents[6].offsetTop);
}
tabs[5].onclick=function(){
window.scrollTo(0, contents[7].offsetTop);
}
tabs[6].onclick=function(){
window.scrollTo(0, contents[8].offsetTop);
}

//获取页面上导航条到顶部的位置
var navigationBar = [];
if (document.getElementsByClassName) {
navigationBar = document.getElementsByClassName('navigation');

} else{
navigationBar = my_getElementsByClassName('navigation');

}
navigaOffsetTop = navigationBar[0].offsetTop;

//给滚动条以及鼠标加上滚动事件
// window.onscroll= naviga_stay_top;
// document.onmousewheel= navigaStayTop;
if(window.attachEvent){
window.attachEvent("onmousewheel", navigaStayTop);
window.attachEvent("onscroll", navigaStayTop);

document.attachEvent("onmousewheel", navigaStayTop);
document.attachEvent("onscroll", navigaStayTop);

}else{
window.addEventListener("mousewheel", navigaStayTop,false);
window.addEventListener("scroll", navigaStayTop,false);

document.addEventListener("mousewheel", navigaStayTop,false);
document.addEventListener("scroll", navigaStayTop,false);

}
//回到顶部
var div1 = document.getElementById('div1');
window.onscroll = function(){
var t = window.pageYOffset;
if (t>200) {
div1.style.display = 'block';

} else{
div1.style.display = 'none';

}
}
div1.onclick = function(){
window.scrollTo(0,0);
}

}
</script>
</head>
<body>
<div class="main">
<div class="content">1</div>
<div id="nav" class="navigation">
<div class="tab">概念</div>
<div class="tab">设计</div>
<div class="tab">功能</div>
<div class="tab">操作系统</div>
<div class="tab">技术规格</div>
<div class="tab">购买方式</div>
<div class="tab">付款方式</div>
</div>
<div class="content">2</div>
<div class="content">3</div>
<div class="content">4</div>
<div class="content">5</div>
<div class="content">6</div>
<div class="content">7</div>
<div class="content">8</div>
<div class="content">9</div>
<div class="content">10</div>
</div>
<div id="div1">回到顶部</div>
</body>
</html>
效果图：
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