📄 web4.html
字号:
<html>
<head>
<title>Untitled</title>
<script language="JavaScript">
function validate()
{
var at=document.getElementById("email").value.indexOf("@");
var age=document.getElementById("age").value;
var fname=document.getElementById("fname").value;
submitOK="true";
if(fname.length>10)
{
alert("the name must be less than 10");
submitOK="false";
}
if(age<1||age>100)
{
alert("the age must be a number between 1 and 100");
submitOK="false";
}
if(at==-1)
{
alert("Not a valid number");
submitOK="false";
}
if(submitOK=="false")
{
return false;
}
}
</script>
</head>
<body>
<form action="tryjs_submitpage.html" onsubmit="return validate()">
name(max 10 characters):<input type="text" id="fname" size="20"></br>
age(from 1 to 100):<input type="text" id="age" size="20"></br>
email<input type="text" id="email" size="20"></br>
</br>
<input type="Submit" value="submit">
</form>
</body>
</html>
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