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ajax检测用户名

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2016-06-08 17:32:431049browse
<script>ec(2);</script>

test

<script><br /> function createAjax() { //该函数将返回XMLHTTP对象实例 <br /> var _xmlhttp; <br /> try { <br /> _xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); //IE的创建方式 <br /> } <br /> catch (e) { <br /> try { <br /> _xmlhttp=new XMLHttpRequest(); //FF等浏览器的创建方式 <br /> } <br /> catch (e) { <br /> _xmlhttp=false; //如果创建失败,将返回false <br /> } <br /> } <br /> return _xmlhttp; //返回xmlhttp对象实例<br /> <br /> } <br /> var exitdos =createAjax();<br /> alert(exitdos)<br /> exitdos.open("GET","www.111cn.net",true);<br /> exitdos.onreadystatechange= function() <br /> {<br /> if (exitdos.readyState == 1) {document.getElementById("b").innerHTML="check..."}<br /> if(exitdos.readyState==4)<br /> {<br /> <br /> //( == 200) &&<br /> alert(exitdos.status) <br /> alert(exitdos.responseText);<br /> }<br /> }<br /> exitdos.send(null);<br /> </script>
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