问题描述
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>EMS</title>
<style type="text/css">
#ems{
position: absolute;
left: 50%;
width: 400px;
height: auto;
margin-left: -200px;
background: lightGreen;
text-align: center;
min-height: 50px;
height: 500px;
overflow-y: scroll;
overflow-x: hidden;
}
#ems input{
height: 25px;
margin-top: 10px;
}
#list{
background: lightBlue;
}
#list li{
text-align: left;
}
</style>
</head>
<body>
<div id="ems">
<div>
<input type="text" id="code">
<input type="button" value="查询" id="btn">
</div>
<div id="list">
</div>
</div>
<script type="text/javascript">
function ajax(data){
//data={data:"",dataType:"xml/json",type:"get/post"，url:"",asyn:"true/false",success:function(){},failure:function(){}}
//data:{username:123,password:456}
//data = 'username=123&password=456';
//第一步：创建xhr对象
var xhr = null;
if(window.XMLHttpRequest){//标准的浏览器
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject('Microsoft.XMLHTTP');
}
//第二步：准备发送前的一些配置参数
var type = data.type == 'get'?'get':'post';
var url = '';
if(data.url){
url = data.url;
if(type == 'get'){
url += "?" + data.data + "&_t="+new Date().getTime();
}
}
var flag = data.asyn == 'true'?'true':'false';
xhr.open(type,url,flag);
//第三步：执行发送的动作
if(type == 'get'){
xhr.send(null);
}else if(type == 'post'){
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send(data.data);
}
//第四步：指定回调函数
xhr.onreadystatechange = function(){
if(this.readyState == 4){
if(this.status == 200){
if(typeof data.success == 'function'){
var d = data.dataType == 'xml'?xhr.responseXML:xhr.responseText;
data.success(d);
}
}else{
if(typeof data.failure == 'function'){
data.failure();
}
}
}
}
}
window.onload = function(){
//注册按钮单击事件
var btn = document.getElementById('btn');
var code = document.getElementById('code').value;
btn.onclick = function(){
var param = {
url:'07ems.php?code='+code,
type:'get',
dataType:'json',
success:function(data){
if(data.status == 0){
var list = data.data.info.context;
var tag = '';
for(var i=0;i<list.length;i++){
var item = list[i];
var desc = item.desc;
var t = new Date();
t.setTime(item.time+'000');
var str = t.getFullYear()+'年'+(t.getMonth()+1)+'月'+t.getDay()+'日'+(t.getHours()>12?' 下午':' 上午')+t.getHours()%12+':'+t.getMinutes()+':'+t.getSeconds();
tag += '<li><div>'+str+'</div><div>'+item.desc+'</div></li>';
}
var ul = document.createElement('ul');
ul.innerHTML = tag;
document.getElementById('list').appendChild(ul);
}else{
var info = data.msg;
document.getElementById('list').innerHTML = info;
}
},failure:function () {
alert(12);
}
};
ajax(param);
}
}
//练习题：用封装好的方法去实现昨天的EMS查询
</script>
</body>
</html>
问题解答
回答1：ajax_json.js
function ajax(){try{this.xmlHttp = new XMLHttpRequest();}catch(e){try{this.xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}catch(e){try{this.xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");}catch(e){alert("your web explorer not support AJAX");return false;}}}}ajax.prototype.doajax=function(){var target,func,var_s,count,all_c,i,xmlHttp,appstr,obj;target=arguments[arguments.length-2];func=arguments[arguments.length-1];var_s="";count=0;all_c=0;for(i=0;i<arguments.length-2;i++){if(count==0){count=1;if(all_c==0){all_c=1;var_s+=arguments[i];}else{var_s+="&"+arguments[i];}}else{count=0;var_s+=("="+escape(replaceall(arguments[i],"+","#add#")));}}xmlHttp=this.xmlHttp;xmlHttp.onreadystatechange=function(){if(xmlHttp.readyState==4 && xmlHttp.status==200){appstr=unescape(unescape(xmlHttp.responseText));obj=eval('('+appstr+')');eval(func+"(obj);");}};xmlHttp.open('POST',target,true);xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");xmlHttp.send(var_s);};function replaceall(str,from,to){while(str.indexOf(from)>=0){str=str.replace(from,to);}return(str);};function aolk(olkt){return replaceall(replaceall(olkt,"#brn#","n"),"#brr#","r");}
client: 文件名demo.html
<script src="ajax_json.js"></script><script> function aa(pp){alert(pp.linkman);alert(aolk(pp.password[0].me));alert(pp.password[1].you);}</script><textarea id=user></textarea><br><input type=button value="1111" onclick='$=new ajax();$.doajax("nm",document.all.user.value,"test_json.php","aa");'>
server: 文件名test_json.php
<?phpfunction escape($str) { preg_match_all("/[x80-xff].|[x01-x7f]+/",$str,$r); $ar = $r[0]; foreach($ar as $k=>$v) { if(ord($v[0]) < 128) $ar[$k] = rawurlencode($v); else $ar[$k] = "%u".bin2hex(iconv("GB2312","UCS-2",$v)); } return join("",$ar); }function unescape($str) { $str = rawurldecode($str); preg_match_all("/(?:%u.{4})|.+/",$str,$r); $ar = $r[0]; foreach($ar as $k=>$v) { if(substr($v,0,2) == "%u" && strlen($v) == 6) $ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4))); } return join("",$ar); }function olk($olkt){return str_replace("#add#","+",str_replace("r","#brr#",str_replace("n","#brn#",str_replace('"','"',$olkt))));}$nm=unescape(stripslashes($_POST["nm"]));echo escape('{"linkman":"1111","password":[{"me":"'.olk($nm).'"},{"you":"hello"}]}');
