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Detailed explanation on the use of blur and focus events in jQuery

黄舟Original: 2017-06-26 14:06:121767browse

This article mainly introduces the application of focus and blur events in jQuery. Friends in need can come and refer to it. I hope it will be helpful to everyone

1. Reasons for demand
When filling in the form, the following effects need to be achieved

2. Specific implementation

<!DOCTYPE html PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<
head
>
<meta http-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>鼠标点击后无文字，挪开鼠标后有文字</title>
<script 
lang
uage="
JavaScript
"src="../jQuery/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
     $(function(){
         /*进入焦点时触发*/
         $("#ac
count
").focus(function(){
              varoldValue = $(this).val();
              if(oldValue == this.defaultValue){
                  $(this).val("");
              }
         });  
         /*失去焦点时触发*/
         $("#account").blur(function(){
              alert("12");
              varoldValue = $(this).val();
              if(oldValue == ""){
                   $(this).val(this.defaultValue);
              }
         });
     });
</script>
</head>
<body>
帐号：<input id="account"name="account" type="text" value="请输入帐号">
</body>
</html>

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