document:标签之间
location:url
history:前进后退
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<html>
<head>
<script type= "text/javascript" >
function show()
{
//弹出一个提示框
window.alert( "hh" );
}
//将show方法绑定到按钮上
window.onload= function ()
{
//定位到按钮
var buttonElement=document.forms[0].mybtn;
//动态绑定show方法
buttonElement.onclick=show;
//show如果加()则一加载网页就弹出提示框
}
function validateForm()
{
var loginform=document.forms[1];
var username=trim(loginform.username.value);
var password=trim(loginform.password.value);
var email=trim(loginform.email.value);
// alert("替代前长度:"+username.length);
// username=trim(username);
// alert("替代后长度:"+username.length);
//判断用户名必填:
if (username.length==0)
{
alert( "用户必填" );
}
else if (!/^[a-zA-Z0-9]+$/.test(username))
{
alert( "用户名必须是英文字母" );
}
else if (password.length==0)
{
alert( "密码必填" );
}
else if (!/^[0-9]{6}$/.test(password))
{
alert( "密码必须为6位数字" );
}
else if (email.length==0)
{
alert( "邮箱必填" );
}
else if (!/^\w+@\w+(\.\w+)+$/.test(email))
{
alert( "邮箱格式不正确" );
}
return false ;
}
//自定义一个去空格的参数
function trim(s)
{
//s.REPLACE(正则表达式,替换的字符)
s=s.replace(/^\s*$/, "" );
return s;
}
</script>
<style type= "text/css" >
.myclass{
position: absolute;
left: 400px;
top: 150px;
}
</style>
</head>
<body>
<div class= "myclass" >
<form action= "#" name= "myform" method= "post" >
<input type= "button" value= "单机" name= "mybtn" />
</form>
</div>
<!--登录页面的表单-->
<form action= "#" name= "loginform" method= "post" onsubmit= "return validateForm()" >
<table border= "1" align= "center" >
<caption>基于js的验证</caption>
<tr>
<th>用户名:</th>
<td><input type= "text" name= "username" /></td>
</tr>
<tr>
<th>密码:</th>
<td><input type= "password" name= "password" /></td>
</tr>
<tr>
<th>邮箱:</th>
<td><input type= "text" name= "email" /></td>
</tr>
<tr>
<td align= "center" colspan= "2" >
<input type= "submit" value= "提交" />
</td>
</tr>
</table>
</form>
</body>
</html>
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以上所述是小编给大家介绍的用JavaScrip正则表达式验证form表单的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://blog.csdn.net/boxyuan/article/details/72620930