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<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <meta charset="utf-8" /> </head> <body> <input id="btn1" type="button" value="提交" /> <script type="text/javascript"> var oBtn = document.getElementById("btn1"); oBtn.onclick = function () { var oAjax = null; if (window.XMLHttpRequest) { oAjax = new XMLHttpRequest(); } else { oAjax = new ActiveXObject(""); } oAjax.open("get", "aaa.txt", true); oAjax.send(); oAjax.onreadystatechange = function () { if (oAjax.readyState == 4) { if (oAjax.status == 200) { alert(oAjax.responseText); } } }; }; </script> </body> </html>
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原文地址：http://www.cnblogs.com/chao2014/p/5131714.html
