本文主要是介绍Ajax从某个页面读取数据，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
在某个页面中存储下面的一些json数据：
{
"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" }
]
} 利用原生Ajax发送请求获取上个页面中的数据，并写入本页面中：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
<html>
<head><meta http-equiv="content-type" content="text/html; charset=utf-8" /><title>People at Clearleft</title>
<script type="text/javascript">
var httpRequest;
//创建异步请求
function creatXMLHttpRequest(){if(window.XMLHttpRequest){httpRequest= new XMLHttpRequest();}else{if(window.ActiveXObject){try{httpRequest = new ActiveXObject("Msxm12.XMLHTTP");}catch(e){try {httpRequest= new ActiveXObject("Microsoft.XMLHTTP");}catch(e){}}}}}
//ajax 回调函数
function callback(){if (httpRequest.readyState==4){if(httpRequest.status==200){/*主要操作*/var xmldata=httpRequest.responseText; /*将数据转为json格式*/var json = eval("("+xmldata+")");
/*给页面中的文本框内容赋值*/
document.getElementById("i").value=json.programmers[0].firstName; //document.getElementById("str").innerHTML=json;//document.getElementById("str").innerHTML=xmldata;}}}
function getdata(){creatXMLHttpRequest();httpRequest.onreadystatechange=callback;httpRequest.open("GET","json.txt" ,true);httpRequest.send(null);
}</script>
</head><body>
<div id="str" style="display:none"></div>
<input id="i" type="text" value="">
<input type="button" value="find data" οnclick="getdata()"/>
</body></html>
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