入口文件index.html

反ajax推送

.send{color:#555;text-align: left;}

.require{color:blue;text-align: right;}

.content_box{text-align: center;margin: 20px;

border: 1px solid #ddd;padding: 20px;}

$(function(){

//发送消息

$('#btn_send').click(function(){

var send_text = $('#send_text').val();

if(send_text.length <= 0){

$('#error_tip').html('不能输入空值');

}else{

send(send_text);

}

});

//按回车键发送消息

$('#send_text').on('keyup',function(e){

if(e.keyCode == 13){

$('#btn_send').trigger('click');

}

});

//建立通讯链接

$('#btn_link').click(function(){

connect();

var _this = $(this);

_this.attr('disabled',true);

_this.html('已连接');

});

});

//建立通讯连接函数

function connect(){

$('#content_box_title').html($('#username').val()+'的消息窗口');

$.ajax({

data:{'user':$('#username').val()},

url:'ajaxPush.PHP',

type:'get',

timeout:0,

dataType:'json',

success:function(data){

$('#content_box').append('

');

connect();

}

});

}

//发送消息函数

function send(massege){

var user =$('#username').val();

$.getJSON('write.php',{'msg':massege,'user':user},function(data){

if(data.sf){

$('#content_box').append('

');

$('#send_text').val('');

}else{

$('#error_tip').html('输入保存错误！');

}

});

}

ajax处理输入 write.php

/**

* Created by TXM.

* Time: 2017/4/18 13:13

* function:

*/

$filename = dirname(__FILE__).'/data.txt';

$isread_file = dirname(__FILE__).'/isread.txt';

$user = dirname(__FILE__).'/user.txt';

//写入消息，消息未读，谁发送的消息

file_put_contents($filename,$_GET['msg']);

file_put_contents($isread_file,'0');

file_put_contents($user,$_GET['user']);

echo json_encode(array('sf'=>true));

长轮询推送 ajaxPush.php

/**

* Created by TXM.

* Time: 2017/4/18 13:12

* function:

*/

$filename = dirname(__FILE__).'/data.txt';

$isread_file = dirname(__FILE__).'/isread.txt';

$userfile = dirname(__FILE__).'/user.txt';

$get_user = $_GET['user'] == '1'?'2':'1';

$msg='';

while(1){

$msg = file_get_contents($filename);

$isread = file_get_contents($isread_file);

$user = file_get_contents($userfile);

//是对方发送的消息，设置消息已读，退出循环。

if($isread == '0' && $get_user == $user){

file_put_contents($isread_file,'1');

break;

}

sleep(1);

}

echo json_encode(array('msg'=>$msg));