Ajax:(AsynchronousJavaScript and XML):
允许浏览器与服务器通信而无须刷新当前页面的技术都被叫做Ajax
•
若应用程序
不需要与其他应用程序共享数据的时候
,
使用
HTML
片段来返回数据时最简单的
• 当远程应用程序未知时 ,XML 文档是首选 , 因为 XML 是 web 服务领域的 “ 世界语”
json的代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <Meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>People at Clearleft</title> <style type="text/css"> @import url("clearleft.css"); </style> <script type="text/javascript"> window.onload=function(){ var aNodes=document.getElementsByTagName("a"); var request=new XMLHttpRequest(); var method="GET"; var url=null; for(var i=0;i<aNodes.length;i++){ aNodes[i].onclick=function(){ url=this.href; request.open(method,url); request.send(null); request.onreadystatechange=function(){ if(request.readyState==4){ if(request.status==200 || request.status==304){ //接收到的是字符串形式的json var result=request.responseText; //使用eval方法，将json字符串转换为json对象 var object=eval("("+result+")"); //得到xml对应的节点的值 var name=object.person.name; var website=object.person.website; var email=object.person.email; //创建对应的节点 /* 创建节点的格式为 <h2><a href="mailto:andy@clearleft.com">Andy Budd</a></h2> <a href="http://andybudd.com/">http://andybudd.com/</a> */ var aNode=document.createElement("a"); aNode.appendChild(document.createTextNode(name)); aNode.href="mailto:"+email; var h2Node=document.createElement("h2"); h2Node.appendChild(aNode); var aNode2=document.createElement("a"); aNode2.appendChild(document.createTextNode(website)); aNode.href=website; var details=document.getElementById("details"); details.innerHTML=""; details.appendChild(h2Node); details.appendChild(aNode2); } } } return false; } } } </script> </head> <body> <h1>People</h1> <ul> <li> <a href="files/andy.js">Andy</a> </li> <li> <a href="files/richard.js">Richard</a> </li> <li> <a href="files/jeremy.js">Jeremy</a> </li> </ul> <div id="details"></div> </body> </html>
xml的代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <Meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>People at Clearleft</title> <style type="text/css"> @import url("clearleft.css"); </style> <script type="text/javascript"> window.onload=function(){ var aNodes=document.getElementsByTagName("a"); var request=new XMLHttpRequest(); var method="GET"; var url=null; for(var i=0;i<aNodes.length;i++){ aNodes[i].onclick=function(){ url=this.href; request.open(method,url); request.send(null); request.onreadystatechange=function(){ if(request.readyState==4){ if(request.status==200 || request.status==304){ //接收到的是XMl格式的 var result=request.responseXML; //得到xml对应的节点的值 var name=result.getElementsByTagName("name")[0].firstChild.nodeValue; var website=result.getElementsByTagName("website")[0].firstChild.nodeValue;; var email=result.getElementsByTagName("email")[0].firstChild.nodeValue;; //创建对应的节点 /* 创建节点的格式为 <h2><a href="mailto:andy@clearleft.com">Andy Budd</a></h2> <a href="http://andybudd.com/">http://andybudd.com/</a> */ var aNode=document.createElement("a"); aNode.appendChild(document.createTextNode(name)); aNode.href="mailto:"+email; var h2Node=document.createElement("h2"); h2Node.appendChild(aNode); var aNode2=document.createElement("a"); aNode2.appendChild(document.createTextNode(website)); aNode.href=website; var details=document.getElementById("details"); details.innerHTML=""; details.appendChild(h2Node); details.appendChild(aNode2); } } } return false; } } } </script> </head> <body> <h1>People</h1> <ul> <li> <a href="files/andy.xml">Andy</a> </li> <li> <a href="files/richard.xml">Richard</a> </li> <li> <a href="files/jeremy.xml">Jeremy</a> </li> </ul> <div id="details"></div> </body> </html>
html的代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <Meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>People at Clearleft</title> <style type="text/css"> @import url("clearleft.css"); </style> <script type="text/javascript"> window.onload=function(){ var aNodes=document.getElementsByTagName("a"); var request=new XMLHttpRequest(); var method="GET"; var url=null; var details=document.getElementById("details"); for(var i=0;i<aNodes.length;i++){ aNodes[i].onclick=function(){ url=this.href; request.open(method,url); request.send(null); request.onreadystatechange=function(){ if(request.readyState==4){ if(request.status==200 || request.status==304){ details.innerHTML=request.responseText; } } } return false; } } } </script> </head> <body> <h1>People</h1> <ul> <li> <a href="files/andy.html">Andy</a> </li> <li> <a href="files/richard.html">Richard</a> </li> <li> <a href="files/jeremy.html">Jeremy</a> </li> </ul> <div id="details"></div> </body> </html>
