<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div class="input-choseNum">
<input type="text" id="num" onblur="zhenshu(this)" />
<span class="sureChoose">确定</span><span class="closeChoose">取消</span>
</div>
</body>
<script type="text/javascript">
function zhenshu(e) {
var num = document.getElementById('num').value;
if(!(/^[a-zA-Z0-9]{6,10}$/.test(num))) {
alert("请输入6-10位 a-z || A-Z ||0-9 ");
e.value=""
return false;
}
}
</script>
</html>