Javascript验证不一致
在下面的代码中,函数和调用都非常相似。 为什么JavaScript验证警报在以下代码中工作:Javascript验证不一致,javascript,html,validation,Javascript,Html,Validation,在下面的代码中,函数和调用都非常相似。 为什么JavaScript验证警报在以下代码中工作: <html> <head> <title>Form Validation</title> <script type="text/javascript"> function validate() { if( document.myForm.Name.value == "" ) { alert( "Please provid
<html>
<head>
<title>Form Validation</title>
<script type="text/javascript">
function validate()
{
if( document.myForm.Name.value == "" )
{
alert( "Please provide your name!" );
document.myForm.Name.focus() ;
return false;
}
return( true );
}
</script>
</head>
<body>
<form name="myForm" onsubmit="return(validate());">
<table cellspacing="2" cellpadding="2" border="1">
<tr>
<td align="right">Name</td>
<td><input type="text" name="Name" /></td>
</tr>
<tr>
<td align="right"></td>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
</form>
</body>
</html>
但在这一点上不起作用:
<!DOCTYPE html>
<html>
<head>
<title> Untitled</title>
<script type='text/javascript'>
}
function validate()
{
if( document.myForm.firstname.value == "" )
{
alert( "Please provide your first name!" );
document.myForm.firstname.focus() ;
return false;
}
return( true );
}
</script>
</head>
<body>
<form action="/cgi-bin/test.cgi" name="myForm" onsubmit="return(validate());">
<h1> Truth </h1>
<label> First Name: </label> <input type="text" name="firstname" id="firstname" maxlength="30" placeholder="John" /> <br><br>
<input type="submit" value="Submit"/> <br>
</form>
</body>
</html>
可能是因为在第二个示例的代码中有一个前导“}” } //