W3School TIY Editor
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<!DOCTYPE html> <html> <head> <script> function showHint(str) { if (str.length == 0) { document.getElementById("txtHint").innerHTML = ""; return; } else { var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("txtHint").innerHTML = this.responseText; } } xmlhttp.open("GET", "/demo/php/gethint.php?q="+str, true); xmlhttp.send(); } } </script> </head> <body> <p><b>在下面的输入框中开始输入名字：</b></p> <form action=""> <label for="fname">名字：</label> <input type="text" id="fname" name="fname" onkeyup="showHint(this.value)"> </form> <p>建议：<span id="txtHint"></span></p> </body> </html>