js校验字符长度(一个中文占两个字符)

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>MyHtml.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">



</head>

<body>
<script src = "jquery-1.4.js"></script>
<div class="box">
<span>请选择</span>
<div class="content">
<textarea id="nojoinreasoncode" name="nojoinreasoncode" rows="4" style="width:400px;" ></textarea>
</div>
<input type="button" id="checkorgentity" value="提交">
</div>
<script>

$(function(){

$("#checkorgentity").click(function(){
//得到属性值
var nojoinreasoncode = document.getElementById("nojoinreasoncode").value;

alert("nojoinreasoncode=="+nojoinreasoncode);

var othernolen = checkothernolen(nojoinreasoncode);
alert("othernolen=="+othernolen);
if(othernolen>30){

alert("证件号码有误！！！！！！");
}

});

})

//校验填写的证件(除身份证外)号码,长度不能超过30个字符
function checkothernolen(certno) {

var certnolen;
var i;
certnolen = 0;

if (certno == "" || certno == undefined) {
flag = false;
} else {
for (i = 0; i < certno.length; i++) {
if (certno.charCodeAt(i) > 255) certnolen += 2;
else certnolen++;
}

}

return certnolen;
}
</script>
</body>
</html>

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