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js to achieve navigation ceiling effect

高洛峰Original: 2018-05-23 16:05:592962browse

Without further ado, please take a look at the code:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    <title>38demo</title>
    <link rel="stylesheet" href="img/mobile-reset.css" rel="external nofollow" />
    <style type="text/css">
      html,body{
        width:100%;
        height:100%;
      }
      .title{
        width:100%;
        margin-bottom:20px;
        background: #fff;
      }
      .titleTap{
        position:fixed;
        left:0;
        top:0;
      }
      .a1{
        margin-top:20px;
      }
      .title li{
        width:33%;
        float:left;
        text-align: center;
      }
      .content{
        text-align: center;
        margin-top:20px;
        z-index:100;
      }
    </style>
  </head>
  <body>
    <!--other-->
    <p class="topHeight">
      <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
        <li>9</li>
        <li>10</li>
      </ul>
    </p>
    <!--title-->
    <ul class="title clearfix">
      <li>1</li>
      <li>2</li>
      <li>3</li>
    </ul>
    <!--content-->
    <ul class="content a1">
      <li>11</li>
      <li>13</li>
      <li>14</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
    </ul>
    <ul class="content a2">
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
    </ul>
    <ul class="content a3">
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
      <li>31</li>
      <li>32</li>
      <li>33</li>
      <li>21</li>
      <li>22</li>
      <li>23</li>
    </ul>
    <script src="js/jquery-1.11.3.min.js"></script>
    <script>    
    function nav(){
      var height=0;
        height = $(".topHeight").height();
      $(window).scroll(function() {
        var w = $("body").scrollTop() || $(document).scrollTop(); //获取滚动值
        if(w > height) {
$(".title").addClass("titleTap");
        } else if(w <= 0){
$(".title").removeClass("titleTap")
        }else{
$(".title").removeClass("titleTap")
        }
      });
    }
    nav();
      $(function() {
        $(".title li").click(function() {
          var index = $(this).index();
          var offsetH = $(".content").eq(index).offset().top;
          console.log(index);
          console.log(offsetH);          $("body").animate({
scrollTop: offsetH-20,
          }, 500);
        })
      })
    </script>
  </body>
</html>

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