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public.js
//1、定义自调用匿名函数，用于解决函数冲突问题 (function(){ //2、定义一个函数用于获取指定id的dom对象 var $ = function(id){ return document.getElementById(id); }; //4、解决Ajax对象兼容性问题 $.init = function() { //W3C浏览器 try { return new XMLHttpRequest(); } catch(e) {} //IE浏览器 try { return new ActiveXObject(‘Microsoft.XMLHTTP‘); } catch(e) {} alert(‘您的浏览器不支持Ajax，请更换‘); } //5、封装Ajax中的GET请求 $.get = function(url,data,callback,type) { //① 创建Ajax对象 var xhr = $.init(); //② 设置回调函数 xhr.onreadystatechange = function() { //⑥ 判断与执行 if(xhr.readyState==4 && xhr.status==200) { //判断type类型 if(type==null) { callback(xhr.responseText); } if(type==‘text‘) { callback(xhr.responseText); } if(type==‘xml‘) { callback(xhr.responseXML); } if(type==‘json‘) { callback(eval(‘(‘+xhr.responseText+‘)‘)); } } } if(data!=null) { url = url+‘?‘+data; } //③ 初始化Ajax对象 xhr.open(‘get‘,url); //④ 解决缓存问题 xhr.setRequestHeader(‘If-Modified-Since‘,‘0‘); //⑤ 发送Ajax请求 xhr.send(null); } //6、实现对Ajax中的POST请求进行封装 $.post = function(url,data,callback,type) { //① 创建Ajax对象 var xhr = $.init(); //② 设置回调函数 xhr.onreadystatechange = function() { //⑥ 判断与执行 if(xhr.readyState==4 && xhr.status==200) { //判断type类型 if(type==null) { callback(xhr.responseText); } if(type==‘text‘) { callback(xhr.responseText); } if(type==‘xml‘) { callback(xhr.responseXML); } if(type==‘json‘) { callback(eval(‘(‘+xhr.responseText+‘)‘)); } } } //③ 初始化Ajax对象 xhr.open(‘post‘,url); //④ 设置请求头信息 xhr.setRequestHeader(‘Content-type‘,‘application/x-www-form-urlencoded‘); //⑤ 发送Ajax请求 xhr.send(data); } //3、把$声明为全局变量 window.$ = $; })();
demo04.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script src=‘public.js‘></script> <script> window.onload = function() { $(‘btnget‘).onclick = function() { //实现Ajax的get请求 $.get(‘demo04_1.php‘,‘username=zhangsan‘,function(msg) { alert(msg); },‘text‘); } $(‘btnpost‘).onclick = function() { //实现Ajax的post请求 $.post(‘demo04_2.php‘,‘first=100&second=20‘,function(msg) { alert(msg); },‘text‘); } $(‘btnxml‘).onclick = function() { //发送get请求获取两个数的四则运算 $.get(‘demo04_3.php‘,‘first=100&second=20‘,function(msg){ var jia = msg.getElementsByTagName(‘jia‘)[0].childNodes[0].nodeValue; var jian = msg.getElementsByTagName(‘jian‘)[0].childNodes[0].nodeValue; var cheng = msg.getElementsByTagName(‘cheng‘)[0].childNodes[0].nodeValue; var chu = msg.getElementsByTagName(‘chu‘)[0].childNodes[0].nodeValue; alert(jia+‘-‘+jian+‘-‘+cheng+‘-‘+chu); },‘xml‘); } $(‘btnjson‘).onclick = function() { $.post(‘demo04_4.php‘,null,function(msg){ //清空下拉选框 $(‘category‘).length = 0; for(var i=0;i<msg.length;i++) { //创建op对象 var op = new Option(msg[i].c_name,msg[i].c_id); //追加op对象到系统的category下拉选框中 $(‘category‘).options.add(op); } },‘json‘); } } </script> </head> <body> <input type="button" id=‘btnget‘ value=‘get请求‘ /> <input type="button" id=‘btnpost‘ value=‘post请求‘ /> <input type="button" id=‘btnxml‘ value=‘xml数据‘ /> <input type="button" id=‘btnjson‘ value=‘json数据‘ /> <hr /> <select id=‘category‘></select> </body> </html>
demo04_1.php
<?php $username = $_GET[‘username‘]; echo ‘hello,‘.$username;
demo04_2.php
<?php $first = $_POST[‘first‘]; $second = $_POST[‘second‘]; echo $first+$second;
demo04_3.php -- 返回XML对象
<?php $first = $_GET[‘first‘]; $second = $_GET[‘second‘]; $jia = $first+$second; $jian = $first-$second; $cheng = $first*$second; $chu = $first/$second; $str = <<<str <counter> <jia>$jia</jia> <jian>$jian</jian> <cheng>$cheng</cheng> <chu>$chu</chu> </counter> str; header(‘Content-type:text/xml; charset=utf-8‘); echo $str;
demo04_4.php -- 返回JSON对象
<?php //链接数据库 mysql_connect(‘localhost‘,‘root‘,‘mysql‘); mysql_query(‘use Shop‘); mysql_query(‘set names utf8‘); //组装sql语句 $sql = "select c_id,c_name from sh_category order by c_id desc"; $res = mysql_query($sql); $data = array(); while($row = mysql_fetch_assoc($res)) { $data[] = $row; } echo json_encode($data);
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原文地址：http://www.cnblogs.com/bybelief/p/5187132.html
