jQuery sum表格单元格
问题描述：
总和表格单元格
<table>
<tr>
<td><input type="text"></td>
<td><input class="price" type="text" value="100"></td>
<td><input class="quantity" type="text" value="2"></td>
<td><input type="text"></td>
</tr>
<tr>
<td><input type="text"></td>
<td><input class="price" type="text" value="100"></td>
<td><input class="quantity" type="text" value="5"></td>
<td><input type="text"></td>
</tr>
<tfoot>
<tr class="summary">
<td>Total:</td>
<td id="total_price"></td>
<td id="total_quantity"></td>
<td class="second"></td>
<td class="third"></td>
</tr>
</tfoot>
</table>
<script>
$(document).ready(function() {
var sum = 0;
var quantity = 0;
$('.price').each(function() {
sum += (parseInt($('.price').val()) * parseInt($('.price').val()));
quantity += parseInt($('.quantity').val();
});
$('#total_price').html(sum);
$('#total_quantity').html(quantity);
})
</script>
输出必须是：总和：700;总数量：7
Output must be: Total sum: 700; Total quantity: 7
答
更改 $（'。price '）到 $（this），引用回调中的元素。
Change $('.price') to $(this), to refer the element inside the callback.
$(document).ready(function() {
var sum = 0;
var quantity = 0;
$('.price').each(function() {
var price = $(this);
var q = price.closest('tr').find('.quantity').val();
sum += parseInt(price.val()) * parseInt(q);
quantity += parseInt(q);
});
$('#total_price').html(sum);
$('#total_quantity').html(quantity);
});