Question

我正在尝试在首次加载该页面时运行一个函数，并在点击products / quantities后，计算并显示用户所选内容的总价格。

一切似乎进展顺利，但我的price变量不断返回NaN。不知道我现在缺少什么。我做了一些搜索，parseInt()似乎就是我想要的，但它仍然会返回NaN。

提前感谢您的帮助。

jQuery(document).ready(function() {
    var bessie = function() {
        //Pull html code for plus/minus qty selector
        var qtyCode = jQuery('.qtyswitcher-qty').html();

        //Pull the current price text that is up on the website
        var bender = jQuery('.price').text();

        //Remove currency symbol and convert price text to a number
        var leela = Number( bender.replace(/[^0-9\.]+/g,""));

        //Get value of qty that is currently selected
        var qty = jQuery('#qtyswitcher-clone-qty').attr('value');

        //Number() above was resulting in NaN, so trying parseInt to make it show a number
        var price = parseInt(jQuery(leela).val(), 10);
        /*More stuff that didn't work
        leela.val();
        parseInt(leela);
        */

        //multiply price by qty to get the total for the users current selection
        var total = price * qty;

        //New html that will be inserted into the page
        var newContent = '<p class="multiply">' + '$' + price + '/ea</p>' + '<p class="multiply2">x</p>' + qtyCode + '<p class="multiply3">=</p> <p class="multiply">' + '$' + total + '</p>';

        //New html being inserted
        jQuery(".qtyswitcher-qty").replaceWith(newContent);
    };

    jQuery('.switcher-label').click(bessie);
    jQuery('#qtyswitcher-oneless').click(bessie);
    jQuery('#qtyswitcher-onemore').click(bessie);

    bessie();
});

Answer 1

在这一行：

var price = parseInt(jQuery(leela).val(), 10);
// ------------------^^^^^^^^^^^^^^^^^^^

您将一个数字传递到jQuery，这会使其尝试在文档中将该数字设置为标记（如div）。它找不到任何东西，所以它会返回一个空集。在空集上调用.val()可为您undefined，当通过parseInt进行解析时，会NaN。

我怀疑你不想这样做，而是直接使用leela：

var price = parseInt(leela, 10);

如果你这样做，你不希望在前一行Number：

var leela = Number( bender.replace(/[^0-9\.]+/g,""));

将它保留为字符串，稍后您将解析它。

尽管如此，整个事情看起来有点令人费解。如果您有价格和数量，那么只需：

var bessie = function(){
    // Pull html code for plus/minus qty selector
    var qtyCode = jQuery('.qtyswitcher-qty').html();

    // Pull the current price text that is up on the website,
    // removing the currency symbol
    var price = jQuery('.price').text().replace(/[^0-9\.]+/g,"");

    // Get value of qty that is currently selected
    // NOTE: I'm assuming here that this value can never be blank
    var qty = jQuery('#qtyswitcher-clone-qty').val();

    // Multiply price by qty to get the total for the user's current selection
    // The strings will be coerced to numbers, but if you want to ensure
    // that base 10 is used even if something has a leading 0 or some
    // such, you could use parseFloat here (you presumably don't want
    // parseInt, I can't imagine "price" is a whole number in dollars)
    var total = price * qty;
    // Or: var total = parseFloat(price) * parseFloat(qty);

    // New html that will be inserted into the page
    var newContent = '<p class="multiply">' + '$' + price + '/ea</p>' + '<p class="multiply2">x</p>' + qtyCode + '<p class="multiply3">=</p> <p class="multiply">' + '$' + total + '</p>';

    //New html being inserted
    jQuery(".qtyswitcher-qty").replaceWith(newContent);
};

使用Number（）后在jQuery中返回一个数字而不是NaN

1 个答案: