代码如下： <!--第一步：把如下代码加入到<head>区域中--> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin var isNN = (navigator.appName.indexOf("Netscape")!=-1); function autoTab(input,len, e) { var keyCode = (isNN) ? e.which : e.keyCode; var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46]; if(input.value.length >= len && !containsElement(filter,keyCode)) { input.value = input.value.slice(0, len); input.form[(getIndex(input)+1) % input.form.length].focus(); } function containsElement(arr, ele) { var found = false, index = 0; while(!found && index < arr.length) if(arr[index] == ele) found = true; else index++; return found; } function getIndex(input) { var index = -1, i = 0, found = false; while (i < input.form.length && index == -1) if (input.form[i] == input)index = i; else i++; return index; } return true; } // End --> </script> <!--第二步：把如下代码加入到<body>区域中--> <center> <form> <table width="400"> <tr> <td> <div align="center"><br> <small> <input onKeyUp="return autoTab(this, 3, event);" size="4" maxlength="3"> </small>- <small> <input onKeyUp="return autoTab(this, 3, event);" size="4" maxlength="3"> </small> - <small> <input onKeyUp="return autoTab(this, 4, event);" size="5" maxlength="4"> </small> - <small> <input onKeyUp="return autoTab(this, 3, event);" size="4" maxlength="3"> </small> - <small> <input onKeyUp="return autoTab(this, 2, event);" size="3" maxlength="2"> </small> - <small> <input onKeyUp="return autoTab(this, 4, event);" size="5" maxlength="4"> </small> </div> </td> </tr> </table> </form> </center>
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