<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8"/>
<style>
span{
display:none;
color: red;
}
</style>
</head>
<body>
<input type="text" id="box"/> <span>请填写数字</span>
</br>
<input type="password" id="psw"/><span>还没有填哦</span>
<br/>
<input type="submit" value="提交"/>
<a href="javascript:;">点我
</a>
</body>
<script>
var oId=document.getElementById("box");
var Span=document.getElementsByTagName("span");
var myregex=/\d{8}/
oId.onfocus=function(){
if(myregex.test(oId.value))
Span[0].style.display="none";
else
Span[0].style.display="inline";
}
oId.onblur=function(){
if(myregex.test(oId.value))
Span[0].style.display="none";
else
Span[0].style.display="inline";
}
document.getElementsByTagName('a')[0].onclick=function(){alert(oId.value);}
</script>
</html>
JavaScript-运用正则表达式检验表单
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转载自blog.csdn.net/zLanaDelRey/article/details/79931536
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