<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title><meta charset="utf-8" /></head><body>请输入邮政编码：<input id="txtPostNumber" /><input type="button" id="btnJudgePost" value="判断邮政编码是否正确"/><script type="text/javascript">window.onload = function () {document.getElementById('btnJudgePost').onclick = function () {//获得用户输入的邮政编码var postCode = document.getElementById('txtPostNumber').value.trim();//建立正则表达式var reg = /^[0-9]{6}$/;//调用正则表达式对象的test()方法,返回一个bool类型的结果var result = reg.test(postCode);alert(result);};};</script></body></html>
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