我正在开发一个多步骤的捐赠表单，它使用JavaScript在步骤之间进行转换。遗憾的是，当从函数返回值时，它并没有更新值。更改步骤是使用以下函数完成的：

function showNextStep(currentStep) {
    var chosenDonationType, checkedAllocations, selectedAllocationValue;
    $("#step" + currentStep).slideToggle("slow", function () {
        if (currentStep === 1) {
            //figure out what kind of donation they are making
            chosenDonationType = $("[name=donationType]").val();
            //show the apppropriate slide
            switch (chosenDonationType) {
            case "oneTimeGift":
                currentStep += 1;
                $("#makingAOneTimeGift").show();
                $("#step" + currentStep).slideToggle("slow");
                break;
            case "recurringDonation":
                currentStep += 1;
                $("#makingARecurringGift").show();
                $("#step" + currentStep).slideToggle("slow");
                break;
                //if somehow they changed it to something else, ignore them and return false.
            default:
                return false;
                //break; not needed due to return
            }//end switch
        } else if (currentStep === 3) {
            checkedAllocations = $("#step3 :checkbox:checked");
            if (checkedAllocations.length === 1) {
                selectedAllocationValue = checkedAllocations.val();//do whatever you want with that
                $("[name=" + selectedAllocationValue + "-Allocation]").val(100);
                currentStep += 2;
            } else {
                currentStep += 1;
            }
            $("#step" + currentStep).slideToggle("slow");
        } else {
            currentStep += 1;
            $("#step" + currentStep).slideToggle("slow");
        }
    });
    return currentStep;
}

我在底部添加了return currentStep，以尝试更新传入的currentStep变量的值。当使用此函数单击Next按钮时，将调用此函数：

//change steps
$(".nextStep").click(function () {
    if (validateCurrentStep(currentStep)) {
        currentStep = showNextStep(currentStep);
    } else {
        return false;
    }
});

遗憾的是，这不是更新变量。一个更容易使用firebug测试的在线版本的页面，可以在here找到。
主页的完整版本可以在这里找到：http://pastebin.com/TtTZCf06
使用的JavaScript的完整版本可以在这里找到：http://pastebin.com/KgLJGUSA
我正在使用

• Twitter引导程序
• jQuery 1.8.2版本
• PHP 5语言
  **UPDATE：**当将return currentStep;移动到出现的$("#step" currentStep).slideToggle("slow")'之后时，它将传递到步骤2，但不允许我前进到步骤3或返回到步骤1。
  **UPDATE 2：**当将其移动到ifelse部分之后，但仍在回调内部时，它没有正确更新，也不允许我从#step2向前或向后
  **UPDATE 3：**删除回调似乎有效：

function showNextStep(currentStep) {
    var chosenDonationType, checkedAllocations, selectedAllocationValue, stepsMoved = 1;
    $("#step" + currentStep).slideToggle("slow")

    if (currentStep === 1) {
        //figure out what kind of donation they are making
        chosenDonationType = $("[name=donationType]").val();
            //show the apppropriate slide
            switch (chosenDonationType) {
            case "oneTimeGift":
                currentStep += 1;
                $("#makingAOneTimeGift").show();
                $("#step" + currentStep).slideToggle("slow");
                break;
            case "recurringDonation":
                currentStep += 1;
                $("#makingARecurringGift").show();
                $("#step" + currentStep).slideToggle("slow");
                break;
                //if somehow they changed it to something else, ignore them and return false.
            default:
                stepsMoved = 0;
                return false;
                //break; not needed due to return
            }//end switch
    } else if (currentStep === 3) {
        checkedAllocations = $("#step3 :checkbox:checked");
        if (checkedAllocations.length === 1) {
            selectedAllocationValue = checkedAllocations.val();//do whatever you want with that
            $("[name=" + selectedAllocationValue + "-Allocation]").val(100);
            currentStep += 2;
            stepsMoved = 2;
        } else {
            currentStep += 1;
        }
        $("#step" + currentStep).slideToggle("slow");
    } else {
        currentStep += 1;
        $("#step" + currentStep).slideToggle("slow");
    }
    return stepsMoved;
}