使用类查找当前表行中的输入字段

应该这样做:

$('.bookDecrement, .bookIncrement').click(function() {

    // Get the current row
    var row = $(this).closest('tr');

    // Determine if we're adding or removing
    var increment = $(this).hasClass('bookDecrement') ? -1 : 1;

    // Get the current quantity
    var quantity = parseInt(row.find('.bookQuantity').val(), 10);
    // Adjust the quantity
    quantity += increment;
    // Quantity must be at least 0
    quantity = quantity < 0 ? 0 : quantity;

    // Get the price
    var price = parseFloat(row.find('.bookPrice').val());

    // Adjust the total
    row.find('.bookTotal').val(quantity * price);

    // Return false to prevent the link from redirecting to '#'
    return false;
});

您可以到达祖先tr并再次下降到其中的输入。这样地:

$("a.bookIncrement").click(function() {
    $(this).closest("tr").find("input.bookPrice").doSomething();
});