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zonghe1.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"></meta>
<style>
form{
font-size: 12px;
font-weight: bold;
}
form input{
-moz-box-sizing: border-box;
box-sizing: border-box;
height:28px;
}
form input[type="submit"]{
width:60px;
background:#205AA7;
color:#FFF;
border:1px solid #205AA7;
}
div{
margin:20px 20px;
}
</style>
<script type="text/javascript">
function validate_form()
{
var label=document.getElementById("Label1")
var len=form.email.value.length;
var sum=0;
var codeval;
for(var i=0;i<len;i++){
codeval=form.email.value.charCodeAt(i);
if (codeval>=0x00 && 0xFF>=codeval){
sum=sum+1;
}
else
{
sum=sum+2;
}
}
if(sum>3 && sum<17)
{
form.email.focus();
label.style.color="#67BF7F";
label.innerHTML="格式正确"
return false;
}
else
{
form.email.focus();
label.style.color="#FF6666";
label.innerHTML="格式错误"
return false;
}
}
</script>
</head>
<body>
<div>
<form name="form" onsubmit="return validate_form()">
用户名: <input type="text" name="email" size="30">
<input type="submit" value="验证">
</br>
<label id="Label1">必填，字符为4-16个字符</label>
</form>
</div>
</body>
</html>