用JavaScript实现的一个IP地址输入框_表单特效

用JavaScript实现的一个IP地址输入框，感觉不是太好，如果是192.168.1.1就必须输入192.168.001.001了别扭啊

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <meta name="GENERATOR" content="Microsoft FrontPage 4.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <style> .a3{width:30;border:0;text-align:center} </style> <script> function mask(obj){ obj.value=obj.value.replace(/[^\d]/g,'') key1=event.keyCode if (key1==37 || key1==39) { obj.blur(); nextip=parseInt(obj.name.substr(2,1)) nextip=key1==37?nextip-1:nextip+1; nextip=nextip>=5?1:nextip nextip=nextip<=0?4:nextip eval("ip"+nextip+".focus()") } if(obj.value.length>=3) if(parseInt(obj.value)>=256 || parseInt(obj.value)<=0) { alert(parseInt(obj.value)+"IP</script>