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js和jquery求table的列和

2013-01-31 21:26 197 查看

js实现

<html>
<head>
<title>求列和</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body onload="sum()">
<table id="ddd">
<tr><td>2</td><td>3</td><td>4</td></tr>
<tr><td>2</td><td>3</td><td>4</td></tr>
<tr><td>2</td><td>3</td><td>4</td></tr>
</table>
<script language="javascript" type="text/javascript">
function sum(){
var second = 0;
var third = 0;
var trObj = document.getElementsByTagName('tr');
for(var i = 1; i<=trObj.length; i++){
for(var j =1;j<=trObj[i-1].getElementsByTagName('td').length;j++)   {
if(j%2==0)
second+=parseInt(trObj[i-1].getElementsByTagName('td')[j-1].innerHTML);
if(j%3==0)
third+=parseInt(trObj[i-1].getElementsByTagName('td')[j-1].innerHTML);
}
}
alert("第二列和为："+second);
alert("第三列和为："+third);
}
</script>
</body>
</html>

jquery实现

<!DOCTYPE html>
<html>
<head>
<title>求列和</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="js/jquery-1.3.2.min.js"></script>
<script language="javascript" type="text/javascript">
$(document).ready(function(){
var second=0;
var third=0;
// $("tr td:nth-child(2)")    ;
$("tr td:nth-child(2)").each(function (i){
second+=parseInt($(this).html());
});
$("tr td:nth-child(3)").each(function(i){
third+=parseInt($(this).html());
});
alert("第二列和为"+second);
alert("第三列和为"+third);
});
</script>
</head>
<body>
<table id="ddd">
<tr><td>2</td><td>3</td><td>4</td></tr>
<tr><td>2</td><td>3</td><td>4</td></tr>
<tr><td>2</td><td>3</td><td>4</td></tr>
</table>
</body>
</html>

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