-----------------------index.html
 <html>
 <head>
 <title>JQuery Ajax跨域访问</title>
 <script src="jquery.js" type="text/javascript"></script>
 <script type="text/javascript">
 $(function () {
 var oBtnTest = $("#btnTest");
 oBtnTest.click(function () {
 oBtnTest.disabled = true;
 var oResult = $("#result");
 oResult.html("loading").css("color", "red");
 try {
 $.get("http://192.168.0.12:8087/js.txt", function (data) {
 oResult.text(data);
 })
 }
 catch (e) {
 alert("正常访问失败!" + e.description);
 }
 jQuery.getScript("http://192.168.0.12:8087/js.txt",
 function () {
 oResult.html("script<br> name:" + user.name + "<br/>email:" + user.email).css("color", "black");
 oBtnTest.disabled = false;
 });
 });
 });
 </script>
 </head>
 <body>
 <button id="btnTest">BtnTest</button>
 <div id="result"></div>
 </body>
 </html>
 ------------------js.txt
 var user = {name:"whq",email:"longtianyu1@163.com"}