javascript: validate chinese zipcode

validate_zipcode_cn.js

 function isPostalCode(object) {
   //校验(国内)邮政编码
   var s = document.getElementById(object.id).value;
   var pattern = /^[0-9]{6}$/;
   if (s !== "") {
     if (!pattern.exec(s)) {
       alert('请输入正确的邮政编码');
       object.value = "";
       object.focus();
     }
   }
 }