<html> <head> </head> <body> ip:port<input type="" name="zhzh" placeholder="ip:port" id="zhzh"> <button onclick="btn()" value="submit">test</button> <script type="text/javascript"> ip_ip = '(25[0-5]|2[0-4]\\d|1\\d\\d|\\d\\d|\\d)'; ip_ipdot = ip_ip + '\\.'; ip_port = '(:(\\d\\d\\d\\d|\\d\\d\\d|\\d\\d|\\d))?'; isIPaddress = new RegExp('^'+ip_ipdot+ip_ipdot+ip_ipdot+ip_ip+ip_port+'$'); function btn(){ var inputValue=document.getElementById("zhzh").value; if (!isIPaddress.test(inputValue)) { console.log("wrong"); } } //10.10.117.119 </script> </body> </html>