如何设置一定时间内只能发送一次请求

复制代码 代码如下:

  <%@ page language="java" contentType="text/html; charset=UTF-8"

  pageEncoding="UTF-8"%>

  <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  <html>

  <head>

  <title>一定时间内,只能发送一次请求</title>

  <script type="text/javascript" src="${pageContext.request.contextPath}/editor/jquery/jquery-1.4.4.min.js"></script>

  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

  <SCRIPT LANGUAGE="JavaScript">

  var maxtime = 10;//设置至少10才能发送一次请求

  function test(obj){

  if(obj.value=='提交'){

  check();

  btn = setInterval("CountDown()",1000);

  }else{

  alert("一分钟内只能发送一次!");

  }

  }

  function CountDown(){

  if(maxtime>=0){

  seconds = Math.floor(maxtime%60);

  msg = "距离时间结束还有"+seconds+"秒";

  $("#btn").val(msg);

  --maxtime;

  }else{

  $("#btn").val("提交");

  clearInterval(btn);

  maxtime = 10;

  }

  }

  function check(){

  alert("哈哈,到我了!");

  }

  </SCRIPT>

  </head>

  <body>

  <input type="button" id="btn" value="提交" onclick="test(this)"/>

  </body>

  </html>