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JS implements positioning navigation bar

php中世界最好的语言Original: 2018-03-15 11:48:243439browse

This time I will bring you JS to implement the positioning navigation bar. What are the precautions for JS to implement the positioning navigation bar? The following is a practical case, let's take a look.

The complete code is as follows:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset="utf-8"> 
<style type="text/css"> 
*{margin:0;padding:0;} 
.nav{width:100%;position:absolute;top:150px;} 
.nav ul{width:1200px;height:50px;margin:0 auto;background:#ccc;} 
.nav ul li{width:150px;height:50px;line-height:50px;text-align:center;list-style:none;float:left;cursor:pointer;} 
.nav ul li:hover{background:#666;} 
.nav ul li a{color:#000;font-size:18px;text-decoration:none;} 
.nav .active{background:#666;} 
.cont{width:1200px;height:4500px;margin:0 auto;} 
.cont ol{width:1200px;height:4500px;margin:0 auto;} 
.cont ol li{width:1200px;height:500px;list-style:none;} 
.cont ol li p{color:#000;font-size:48px;} 
</style> 
</head> 
<body> 
<p style="height:200px;width:100%;"></p> 
<p class="nav"> 
  <ul> 
    <li class="active">page1</li> 
    <li>page2</li> 
    <li>page3</li> 
    <li>page4</li> 
    <li>page5</li> 
    <li>page6</li> 
    <li>page7</li> 
    <li>page8</li> 
  </ul> 
</p> 
<p class="cont"> 
  <ol> 
    <li style="background:#aaa"><p>page1</p></li> 
    <li style="background:#999"><p>page2</p></li> 
    <li style="background:#666"><p>page3</p></li> 
    <li style="background:#333"><p>page4</p></li> 
    <li style="background:#bbb"><p>page5</p></li> 
    <li style="background:#aaa"><p>page6</p></li> 
    <li style="background:#ccc"><p>page7</p></li> 
    <li style="background:#000"><p>page8</p></li> 
  </ol> 
</p>  
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.1.min.js"></script> 
<script type="text/javascript">  
$(".nav ul li").click(function(){ 
    var index=$(this).index(); 
    var i=150+index*501+'px' 
    $("html,body").animate({scrollTop:i},500)      
  })    
$(window).scroll(function(){ 
    if($(window).scrollTop()>150){ 
      $(".nav").css({"position":"fixed","top":"0px"}) 
    } 
    else{ 
      $(".nav").css({"position":"absolute","top":"150px"}) 
    }  
  for(var x=0;x<8;x++){ 
    var i=150+x*500 
  if($(window).scrollTop()>i && $(window).scrollTop()<i+500){   
    $(".nav ul li").eq(x).addClass("active").siblings().removeClass("active")} 
  }  
}) 
</script> 
</body> 
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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