jQuery 隔行换色 支持键盘上下键，按Enter选定值

代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style>
<!--
/* css for data grid*/
.datagrid {
width: 100%;
background-color: #6595d6;
}
.datagrid caption {
}
.datagrid th {
/*background-image: url("images/div.th.background-image.gif" );*/
background-color: #6595d6;
color: #ffffff;
font-size: 12px;
font-weight: bold;
height: 25px;
line-height: 25px;
text-align: center;
}
.datagrid tr {
}
.datagrid td {
padding: 5px;
background-color: #ffffff;
}
/* css for OEC form page*/
.row_focus {
background: #B0FFB0;
border: 1px solid #00cc33;
}
/* css or table row effect */
tr.alt td {
background: #ecf6fc;
}
tr.over td {
background: #bcd4ec;
}
-->
</style>
<title>无标题文档</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<label>
<input type="text" name="txt_no" id="txt_no" />
</label>
<br />
<table width="600" border="0" cellpadding="3" cellspacing="1" class="datagrid">
<tr>
<td>1</td>
<td> 张三</td>
<td> </td>
</tr>
<tr>
<td>2</td>
<td>李四</td>
<td> </td>
</tr>
<tr>
<td>3</td>
<td>王五</td>
<td> </td>
</tr>
<tr>
<td>4</td>
<td>马六</td>
<td> </td>
</tr>
<tr>
<td>5</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>6</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>7</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>8</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>9</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>10</td>
<td> </td>
<td> </td>
</tr>
</table>
<input type="hidden" name="prevTrIndex" id="prevTrIndex" value="-1" />
</form>
<script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="http://js-hotkeys.googlecode.com/files/jquery.hotkeys-0.7.9.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#prevTrIndex").val("-1");//默认-1
var trSize = $(".datagrid tr").size();//datagrid中tr的数量

function clickTr(currTrIndex){
var prevTrIndex = $("#prevTrIndex").val();
if (currTrIndex > -1){
$("#tr_" + currTrIndex).addClass("over");
}
$("#tr_" + prevTrIndex).removeClass("over");
$("#prevTrIndex").val(currTrIndex);
}

$(".datagrid tr").mouseover(function(){//鼠标滑过
$(this).addClass("over");
}).mouseout(function(){ //鼠标滑出
$(this).removeClass("over");
}).each(function(i){ //初始化 id 和 index 属性
$(this).attr("id", "tr_" + i).attr("index", i);
}).click(function(){ //鼠标单击
clickTr($(this).attr("index"));
}).dblclick(function(){ //鼠标双击
$("#txt_no").val(($(this).find("td")[0]).innerHTML);
});

$(".datagrid tr:even").addClass("alt"); //偶行变色

$(document).bind('keydown', 'up', function(evt){ //↑
var prevTrIndex = parseInt($("#prevTrIndex").val());
if (prevTrIndex == -1 || prevTrIndex == 0){
clickTr(trSize - 1);
} else if(prevTrIndex > 0){
clickTr(prevTrIndex - 1);
}
return false;
}).bind('keydown', 'down', function(evt){ //↓
var prevTrIndex = parseInt($("#prevTrIndex").val());
if (prevTrIndex == -1 || prevTrIndex == (trSize - 1)){
clickTr(0);
} else if (prevTrIndex < (trSize - 1)) {
clickTr(prevTrIndex + 1);
}
return false;
}).bind('keydown', 'return', function(evt){ //
var prevTrIndex = parseInt($("#prevTrIndex").val());
$("#txt_no").val(($("#tr_" + prevTrIndex).find("td")[0]).innerHTML);
return false;
});
clickTr(0);
})
</script>
</body>
</html>