ajax 读取json数据

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  • 首先建立json.txt文件
  • {
  • "programmers": [
  • { "firstName": "Brett","lastName":"McLaughlin","email": "brett@newInstance.com" },
  • { "firstName": "Jason","lastName":"Hunter","email": "jason@servlets.com" },
  • { "firstName": "Elliotte","lastName":"Harold","email": "elharo@macfaq.com" }
  • ],
  • "authors": [
  • { "firstName": "Isaac","lastName": "Asimov","genre": "science fiction" },
  • { "firstName": "Tad","lastName": "Williams","genre": "fantasy" },
  • { "firstName": "Frank","lastName": "Peretti","genre": "christian fiction" }
  • ],
  • "musicians": [
  • { "firstName": "Eric","lastName": "Clapton","instrument": "guitar" },
  • { "firstName": "Sergei","lastName": "Rachmaninoff","instrument": "piano" }
  • ]
  • }
  • 通过异步调用,来读取json数据
  • <html xmlns="http://www.w3.org/1999/xhtml" >
  • <head runat="server">
  • <script type="text/javascript">
  • var xmlHttp;
  • function createXMLHttpRequest()
  • {
  • if(window.ActiveXObject)
  • {
  • xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  • }
  • else if(window.XMLHttpRequest)
  • {
  • xmlHttp = new XMLHttpRequest();
  • }
  • }
  • function startRequest()
  • {
  • createXMLHttpRequest();
  • try
  • {
  • xmlHttp.onreadystatechange = handleStateChange;
  • xmlHttp.open("GET","Json.txt",true);
  • xmlHttp.send(null);
  • }
  • catch(exception)
  • {
  • alert("xmlHttp Fail");
  • }
  • }
  • function handleStateChange()
  • {
  • if(xmlHttp.readyState == 4)
  • {
  • if (xmlHttp.status == 200 || xmlHttp.status == 0)
  • {
  • var result = xmlHttp.responseText;
  • var json = eval("(" + result + ")");
  • alert(json.programmers[0].firstName);//读取json数据
  • //alert(json.sex);
  • }
  • }
  • }
  • </script>
  • </head>
  • <body>
  • <div>
  • <input type="button" value="AjaxTest" onclick="startRequest();" />
  • </div>
  • </body>
  • </html>
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