JavaScript正则表达式校验非正整数实例

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
html xmlns="http://www.w3.org/1999/xhtml">
head>
 title>/title>
 script type="text/javascript">
 function validation() {
 var val = document.getElementById("txtNumber").value;
 var regu = /^((-\d+)|(0+))$/;
 if (val != "") {
 if (!regu.test(val)) {
  document.getElementById("labResult").style.color = "red";
  document.getElementById("labResult").innerHTML = "验证失败！";
 } else {
  document.getElementById("labResult").style.color = "green";
  document.getElementById("labResult").innerHTML = "验证成功！";
 }
 }
 }
 /script>
/head>
body>
 input id="txtNumber" name="txtNumber" type="text" />
 input id="btnValidation" name="btnValidation" type="button" value="校验" onclick="validation()" />
 验证结果：label id="labResult" >/label>
/body>
/html>