本文实例讲述了jQuery+Ajax实现限制查询间隔的方法。分享给大家供大家参考，具体如下：

Jquery异步查询加载效果

.span_query { cursor:pointer;}

$(function () {

$(".span_query").click(function () {

var val = $(this).attr("data-value");

var id = $(this).attr("id");

AjaxQuery($(this),val);

});

});

function AjaxQuery(obj, v) {

$.ajax({

url: 'Ajax/Handler.ashx?queryType=score&queryValue=' + v,

type: 'POST',

dataType: 'text',

timeout: 10000,

cache: false,

beforeSend: LoadFunction,

error: erryFunction,

success: succFunction

})

function LoadFunction() {

obj.html('');

}

function erryFunction() {

obj.html('error');

}

function succFunction(tt) {

obj.html('');

obj.html(tt);

}

}

using System;

using System.Web;

using System.Web.SessionState;

//Handler.ashx

public class Handler : IHttpHandler, IRequiresSessionState

{

public void ProcessRequest(HttpContext context)

{

context.Response.ContentType = "text/plain";

string queryType = context.Request["queryType"];

string queryValue = context.Request["queryValue"];

if (context.Session["preQuery"] == null) //第一次查询

{

context.Session["preQuery"] = queryValue + "@" + DateTime.Now.AddDays(-1);

context.Session["currQuery"] = queryValue + "@" + DateTime.Now;

}

else //存在上次查询

{

string[] preStrs = context.Session["currQuery"].ToString().Split('@');

context.Session["preQuery"] = queryValue + "@" + preStrs[1]; //重置为当前查询参数+上次查询时间

context.Session["currQuery"] = queryValue + "@" + DateTime.Now;

}

string[] strs=context.Session["preQuery"].ToString().Split('@');

if (strs[0] == queryValue) //同一请求限制查询间隔

{

DateTime preTime = Convert.ToDateTime(strs[1]);

DateTime nowTime = DateTime.Now;

bool flag = CheckQueryTimeSpan(preTime, nowTime, 3);

if (flag)

{

context.Response.Write("查询间隔3秒");

}

else

{

context.Response.Write("98");

}

}

context.Response.End();

}

///

/// 判断本次查询和上次查询间隔是否小于指定秒数

///

/// 上次查询时间

/// 本次查询时间

/// 指定秒数

///

public bool CheckQueryTimeSpan(DateTime preTime, DateTime nowTime, int timeSpan)

{

TimeSpan ts = nowTime - preTime;

int difference = ts.Seconds;

bool flag = (difference < timeSpan) ? true : false;

return flag;

}

public bool IsReusable {

get {

return false;

}

}

}

希望本文所述对大家jQuery程序设计有所帮助。