获取checkbox选中当前行的值

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Untitled</title>
<script>
function test(o) {
    if (!o.checked) {
        return;
    }
    var checks = document.getElementsByName("checkbox");
    var tr = o.parentNode.parentNode;
    console.log(tr.length);
    var tds = tr.cells;
    var str = "you click ";
    for(var i = 0;i < tds.length;i++){
        if (i < 3) {
            str = str + tds[i].innerHTML + "--";
        }
    }
    alert(str);
}
</script>
</head>
<body>
<table width="60%" cellspacing="0" cellpadding="0" align="left" border="1" bordercolordark="#ffffff" bordercolorlight="#B3B5B4" >
<tbody id="tabstore1">
<tr>
<td>b1</td>
<td>b2</td>
<td>b3</td>
<td><input type="checkbox" name="checkbox" onclick="test(this);"/></td>
</tr>
<tr>
<td>c1</td>
<td>c2</td>
<td>c3</td>
<td><input type="checkbox" name="checkbox" onclick="test(this);"/></td>
</tr>
</tbody>
</table>
</body>
</html>
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