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分享E-mail 判断！！！！
注册信息时，要填写E-mail项，怎样去判断它是一个合法的E-mail。（格式正确就行了，不需要验证它是否真正存在）
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shepengtao 2004-02-03
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function email_test(str)
{
var i,flag=0;
var at_symbol=0;
//“@”检测的位置
var dot_symbol=0;
//“.”检测的位置
if(char_test(str.charAt(0))==0 )
return (1);
//首字符必须用字母
for (i=1;i<str.length;i++)
if(str.charAt(i)=='@')
{
at_symbol=i;
break;
}
//检测“@”的位置
if(at_symbol==str.length-1 || at_symbol==0)
return(2);
//没有邮件服务器域名
if(at_symbol<3)
return(3);
//帐号少于三个字符
if(at_symbol>19 )
return(4);
//帐号多于十九个字符
for(i=1;i<at_symbol;i++)
if(char_test(str.charAt(i))==0 && spchar_test(str.charAt(i))==0)
return (5);
for(i=at_symbol+1;i<str.length;i++)
if(char_test(str.charAt(i))==0 && spchar_test(str.charAt(i))==0)
return (5);
//不能用其它的特殊字符
for(i=at_symbol+1;i<str.length;i++)
if(str.charAt(i)=='.') dot_symbol=i;
for(i=at_symbol+1;i<str.length;i++)
if(dot_symbol==0 || dot_symbol==str.length-1)
//简单的检测有没有“.”，以确定服务器名是否合法
return (6);
return (0);
//邮件名合法
}
lei414 2004-02-03
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具体的可以这样
<script language="javascript">
function ismail(s) {
var str=s;
var reg=/^\w+((-\w+) |(\.\w+))*\@[A-Za-z0-9]+((\. |-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/
alert(reg.test(str));
}
</script>
<input type=text name="mail">
<input type=button onclick="ismail(document.all.mail.value)" value="Check">
<script language="javascript">
function ismail(s) {
var str=s;
var reg=/^\w+((-\w+) |(\.\w+))*\@[A-Za-z0-9]+((\. |-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/
alert(reg.test(str));
}
</script>
<input type=text name="mail">
<input type=button onclick="ismail(document.all.mail.value)" value="Check">
jhlgxyxl 2004-02-03
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哇，好深懊哦。有一点怕怕。不过会仔细看的。请继续回贴，谢谢！
lei414 2004-02-03
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function ismail(mail)
{
return(new RegExp(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/).test(mail));
}
{
return(new RegExp(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/).test(mail));
}
jidechen 2004-02-03
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_validateForm() { //v4.0
var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
if (val) { nm=val.name; if ((val=val.value)!="") {
if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
} else if (test!='R') { num = parseFloat(val);
if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
min=test.substring(8,p); max=test.substring(p+1);
if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
} } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
} if (errors) alert('The following error(s) occurred:\n'+errors);
document.MM_returnValue = (errors == '');
}
//-->
</script>
</head>
<body>
<form name="form1" method="post" action="">
<input name="textfield" type="text" onChange="MM_validateForm('textfield','','NisEmail');return document.MM_returnValue">
</form>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_validateForm() { //v4.0
var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
if (val) { nm=val.name; if ((val=val.value)!="") {
if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
} else if (test!='R') { num = parseFloat(val);
if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
min=test.substring(8,p); max=test.substring(p+1);
if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
} } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
} if (errors) alert('The following error(s) occurred:\n'+errors);
document.MM_returnValue = (errors == '');
}
//-->
</script>
</head>
<body>
<form name="form1" method="post" action="">
<input name="textfield" type="text" onChange="MM_validateForm('textfield','','NisEmail');return document.MM_returnValue">
</form>
</body>
</html>
popcode 2004-02-03
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javascript:
if (theform.email.value.indexOf("'",0) >= 0 || theform.email.value.indexOf(" ",0) >= 0)
{
alert("电子邮件中不能包含空格，单引号等非法字符！")
theform.email.focus()
return false
}
if (theform.email.value.indexOf("@",0) < 0 || theform.email.value.indexOf(".",0) < 0)
{
alert("邮件地址错误！")
theform.email.focus()
return false
}
if (theform.email.value.indexOf("'",0) >= 0 || theform.email.value.indexOf(" ",0) >= 0)
{
alert("电子邮件中不能包含空格，单引号等非法字符！")
theform.email.focus()
return false
}
if (theform.email.value.indexOf("@",0) < 0 || theform.email.value.indexOf(".",0) < 0)
{
alert("邮件地址错误！")
theform.email.focus()
return false
}
