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1 <html xmlns="http://www.w3.org/1999/xhtml"> 2 <head runat="server"> 3 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 4 <title></title> 5 <script type="text/javascript"> 6 onload = function () { 7 window.document.getElementById("Button1").onclick = function () { 8 var xhr = null 9 if (XMLHttpRequest) { 10 xhr = new XMLHttpRequest(); 11 } else { 12 xhr = new ActiveXObject("Microsoft.XMLHTTP");//兼容IE6，IE5 13 } 14 xhr.open("get", "Handler2.ashx?a=bbb",true); 15 xhr.send(); 16 xhr.onreadystatechange = function () {//回调函数 17 if(xhr.readyState==4){ 18 if (xhr.status == 200) { 19 alert(xhr.responseText); 20 } 21 } 22 }; 23 24 } 25 26 }; 27 28 </script> 29 </head> 30 <body> 31 <form id="form1" runat="server"> 32 <div> 33 34 <asp:Button ID="Button1" runat="server" Text="Button" /> 35 36 </div> 37 </form> 38 </body> 39 </html>
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原文地址：http://www.cnblogs.com/chao2014/p/4960542.html
