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jQuery responds to mouse events and hides and displays input default values_jquery

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2016-05-16 16:38:431011browse

Share an example of how jQuery hides and shows the input default value. 

<!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" /> 
<title>jQuery 隐藏与显示 input 默认值</title> 
<script language="javascript" src="jquery-1.7.1.min.js"></script> 
</head> 
<body> 
<p><input type="text" value="请输入邮箱地址" id="email" id="email" /></p> 
<p><input type="button" value="提交" /></p> 
<script type="text/javascript"> 
$("#email").focus(function(){ 
var email_txt = $(this).val(); 
if (email_txt == this.defaultValue) { 
$(this).val(""); 
} 
}) 
$("#email").blur(function(){ 
var email_txt = $(this).val(); 
if (email_txt == "") { 
$(this).val(this.defaultValue); 
} 
}) 
</script> 
</body> 
</html>
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