ajax 异步javascript
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<html><head><script type="text/javascript">function showHint(str){var xmlhttp;if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; }if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); }else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("txtHint").innerHTML=xmlhttp.responseText; } }xmlhttp.open("GET","/ajax/gethint.asp?q="+str,true);xmlhttp.send();}</script></head><body><h3>请在下面的输入框中键入字母（A - Z）：</h3><form action=""> 姓氏：<input type="text" id="txt1" onkeyup="showHint(this.value)" /></form><p>建议：<span id="txtHint"></span></p> </body></html>
