冒泡事件阻止默认行为

发布时间：2020-04-03 18:40:52 作者：WarmDoll
来源：网络阅读：454

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<script src="jquery-1.8.1.js"></script>
<title>无标题文档</title>
</head>
<style>
.d3{
   width:60px;
   height:60px;
   border:1px solid red;
   }
   .d2{
   width:40px;
   height:40px;
   border:1px solid red;
   }
   .d1{
   width:20px;
   height:20px;
   border:1px solid red;
   }
</style>
<body>
<div class="d3">
    <div class="d2">
     <div class="d1"></div>
    </div>
</div>
<form action="test.html">
   用户名：<input type="text" id="username"/><br/>
   <input type="submit" value="提交" id="sub"/>
</form>
<div id="msg"></div>
</body>
<script type="text/javascript">
    $(".d1").bind("click",function(event){//event时间对象当点击元素时事件对象被创建事件处理函数执行完后事件对象被销毁
       $(this).css("background","yellow");
       event.stopPropagation();//停止事件冒泡或者return false;
       })
   $(".d2").bind("click",function(event){
       $(this).css("background","pink")
       event.stopPropagation();
       })
   $(".d3").bind("click",function(event){
       $(this).css("background","#000")
       event.stopPropagation();
       })
</script>
<script type="text/javascript">
   $(function(){
       $("#sub").bind("click",function(event){
           var username=$("#username").val();
           if(username==""){
               $("#msg").html("<p>文本框的值不能为空</p>");
               event.preventDefault();//阻止默认行为或者用return false;

               }
           })
       })
</script>
</html>

冒泡事件 阻止默认行为

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冒泡事件阻止默认行为