<!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">
//First step: Create xhr object var xhr = null;if(window.XMLHttpRequest){//Standard browserxhr = new XMLHttpRequest();}else{xhr = new ActiveXObject('Microsoft.XMLHTTP');}//Step 2 : Prepare some configuration parameters before sendingvar 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);
##window.onload = function(){
//Register button click event
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() 'Year' (t.getMonth( ) 1) 'month' t.getDay() 'day' (t.getHours()>12?' afternoon':' morning') t.getHours() ':' 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);
}
}
//Exercise questions: Use encapsulated methods to implement Yesterday’s EMS query
</script>
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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: File name 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: File name test_json.php
<?php function 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"}]}');