<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>prompt</title> <script type="text/javascript"> function discriCard(){ var UUserCard = prompt("请输入你的身份证号码"); var tmpStr= ""; var birthday= ""; var strReturn= ""; alert(0); var birthday=document.getElementById("UUserCard "); if (UUserCard.length==15) { tmpStr = birthday.substring(6, 12); tmpStr = "19" + tmpStr; tmpStr = tmpStr.substring(0, 4) + "-" + tmpStr.substring(4, 6) + "-" + tmpStr.substring(6); document.write(tmpStr); } else { tmpStr = birthday.substring(6, 14); tmpStr = tmpStr.substring(0, 4) + "-" + tmpStr.substring(4, 6) + "-" + tmpStr.substring(6); document.write(tmpStr);} } </script></head><body> <input name="button" type="button" onClick="discriCard()" value="点击我，输入身份证号!" /></body></html>
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luofuxiang
TA贡献34条经验 获得超34个赞
调试了一下楼主的代码，发现有一处存在问题，UUserCard 只是一个变量，而不是某个标签的ID，所以不需要调用getElementByID来获取其值，直接var birthday=UUserCard;即可，代码已经改过调试好了，只改了一行，有注释，楼主可以参考一下。
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>prompt</title>
<script type="text/javascript">
function discriCard(){
var UUserCard = prompt("请输入你的身份证号码");
var tmpStr= "";
var birthday= "";
var strReturn= "";
alert(0);
//var birthday=document.getElementById("UUserCard "); 改为
var birthday=UUserCard;
if (UUserCard.length==15)
{
tmpStr = birthday.substring(6, 12);
tmpStr = "19" + tmpStr;
tmpStr = tmpStr.substring(0, 4) + "-" + tmpStr.substring(4, 6) + "-" + tmpStr.substring(6);
document.write(tmpStr);
}
else {
tmpStr = birthday.substring(6, 14);
tmpStr = tmpStr.substring(0, 4) + "-" + tmpStr.substring(4, 6) + "-" + tmpStr.substring(6);
document.write(tmpStr);}
}
</script>
</head>
<body>
<input name="button" type="button" onClick="discriCard()" value="点击我，输入身份证号!" />
</body>
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