zoukankan html css js c++ java

导航菜单栏隐藏及显示

思路分两步：

1.先把每层的框写出来

2.再根据嵌套关系写事件：onmouseover,onmouseout.

CSS部分

  1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  2 <html xmlns="http://www.w3.org/1999/xhtml">
  3 <head>
  4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  5 <title>无标题文档</title>
  6 <style type="text/css">
  7 .a
  8 {
  9     
 10     width:80px;
 11     height:40px;
 12 }
 13 #a
 14 {
 15     left:300px;
 16     top:200px;
 17     background-color:#FF0;
 18     position:absolute;
 19     overflow:hidden;
 20 }
 21 .b
 22 {
 23     background-color:#30F;
 24     width:80px;
 25     height:120px;
 26     position:absolute;
 27     left:0px;
 28     top:40px;
 29 }
 30 #b1
 31 {
 32     left:0px;
 33     top:0px;
 34     background-color:#C0F;
 35     position:absolute;
 36     overflow:hidden;
 37 }
 38 #b2
 39 {
 40     left:0px;
 41     top:40px;
 42     background-color:#0FC;
 43     position:absolute;
 44     overflow:hidden;
 45 }
 46 #b3
 47 {
 48     left:0px;
 49     top:80px;
 50     background-color:#F63;
 51     position:absolute;
 52     overflow:hidden;
 53 }
 54 </style>
 55 </head>
 56 
 57 <body>
 58 <div class="a" id="a" onmouseover="over1()" onmouseout="out1()">
 59 <div class="b">
 60 <div class="a" id="b1" onmouseover="over2()" onmouseout="out2()">
 61 <div style="background-color:#C0F;80px;height:120px;left:80px;top:0px;position:absolute;"></div>
 62 </div>
 63 <div class="a" id="b2" onmouseover="over3()" onmouseout="out3()">
 64 <div style="background-color:#0FC;80px;height:120px;left:80px;top:0px;position:absolute;"></div>
 65 </div>
 66 <div class="a" id="b3" onmouseover="over4()" onmouseout="out4()">
 67 <div style="background-color:#F63;80px;height:120px;left:80px;top:0px;position:absolute;"></div>
 68 </div>
 69 </div>
 70 </div>
 71 
 72 
 73 </body>
 74 </html>
 75 <script language="javascript">
 76 
 77 function over1()
 78 {
 79     var a=document.getElementById("a");
 80     a.setAttribute("style","overflow:visible");    
 81 }
 82 function out1()
 83 {
 84     var a=document.getElementById("a");
 85     a.setAttribute("style","overflow:hidden");    
 86 }
 87 function over2()
 88 {
 89     var a=document.getElementById("b1");
 90     a.setAttribute("style","overflow:visible");    
 91 }
 92 function out2()
 93 {
 94     var a=document.getElementById("b1");
 95     a.setAttribute("style","overflow:hidden");    
 96 }
 97 function over3()
 98 {
 99     var a=document.getElementById("b2");
100     a.setAttribute("style","overflow:visible");    
101 }
102 function out3()
103 {
104     var a=document.getElementById("b2");
105     a.setAttribute("style","overflow:hidden");    
106 }
107 function over4()
108 {
109     var a=document.getElementById("b3");
110     a.setAttribute("style","overflow:visible");    
111 }
112 function out4()
113 {
114     var a=document.getElementById("b3");
115     a.setAttribute("style","overflow:hidden");    
116 }
117 
118 </script>

显示效果如下：

查看全文

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原文地址：https://www.cnblogs.com/kellybutterfly/p/5471736.html