要更改javascript中数据成员的值吗

我有一个这样的javascript原型

Spry.Widget.TabbedPanels = function(element, opts)
{
    this.element = this.getElement(element);
    this.defaultTab = 0; // Show the first panel by default.
    this.tabSelectedClass = "TabbedPanelsTabSelected";
    this.tabHoverClass = "TabbedPanelsTabHover";
    this.tabFocusedClass = "TabbedPanelsTabFocused";
    this.panelVisibleClass = "TabbedPanelsContentVisible";
    this.focusElement = null;
    this.hasFocus = false;
    this.currentTabIndex = 0;
    this.enableKeyboardNavigation = true;
    this.nextPanelKeyCode = Spry.Widget.TabbedPanels.KEY_RIGHT;
    this.previousPanelKeyCode = Spry.Widget.TabbedPanels.KEY_LEFT;

    Spry.Widget.TabbedPanels.setOptions(this, opts);

    // If the defaultTab is expressed as a number/index, convert
    // it to an element.

    if (typeof (this.defaultTab) == "number")
    {
        if (this.defaultTab < 0)
            this.defaultTab = 0;
        else
        {
            var count = this.getTabbedPanelCount();
            if (this.defaultTab >= count)
                this.defaultTab = (count > 1) ? (count - 1) : 0;
        }

        this.defaultTab = this.getTabs()[this.defaultTab];
    }

    // The defaultTab property is supposed to be the tab element for the tab content
    // to show by default. The caller is allowed to pass in the element itself or the
    // element's id, so we need to convert the current value to an element if necessary.

    if (this.defaultTab)
        this.defaultTab = this.getElement(this.defaultTab);

    this.attachBehaviors();
};

Spry.Widget.TabbedPanels.prototype.getElement = function(ele)
{
    if (ele && typeof ele == "string")
        return document.getElementById(ele);
    return ele;
};

---

警报给了我屏幕截图。而且这个值没有改变。有人能帮我找到问题吗。

问题是，在执行代码以选择相应的元素后，您正在更改属性的值

您应该执行类似的操作：

Spry.Widget.TabbedPanels = function(element, opts)
{
    this.element = this.getElement(element);
    this.defaultTab = 0; // Show the first panel by default.
    this.tabSelectedClass = "TabbedPanelsTabSelected";
    this.tabHoverClass = "TabbedPanelsTabHover";
    this.tabFocusedClass = "TabbedPanelsTabFocused";
    this.panelVisibleClass = "TabbedPanelsContentVisible";
    this.focusElement = null;
    this.hasFocus = false;
    this.currentTabIndex = 0;
    this.enableKeyboardNavigation = true;
    this.nextPanelKeyCode = Spry.Widget.TabbedPanels.KEY_RIGHT;
    this.previousPanelKeyCode = Spry.Widget.TabbedPanels.KEY_LEFT;

    Spry.Widget.TabbedPanels.setOptions(this, opts);

    // If the defaultTab is expressed as a number/index, convert
    // it to an element.
    this.setDefaultTab = function(tab){
        this.defaultTab = tab;
        if (typeof (this.defaultTab) == "number")
        {
            if (this.defaultTab < 0)
                this.defaultTab = 0;
            else
            {
                var count = this.getTabbedPanelCount();
                if (this.defaultTab >= count)
                    this.defaultTab = (count > 1) ? (count - 1) : 0;
            }

            this.defaultTab = this.getTabs()[this.defaultTab];
        }

        // The defaultTab property is supposed to be the tab element for the tab content
        // to show by default. The caller is allowed to pass in the element itself or the
        // element's id, so we need to convert the current value to an element if necessary.

        if (this.defaultTab)
            this.defaultTab = this.getElement(this.defaultTab);
    }
    this.setDefaultTab(this.defaultTab);
    this.attachBehaviors();
};

Spry.Widget.TabbedPanels.prototype.getElement = function(ele)
{
    if (ele && typeof ele == "string")
        return document.getElementById(ele);
    return ele;
};

---

我找到了解决办法

TabbedPanels1['defaultTab'].value

这里显示的是这个值，我通过这种方式将它设置为1

TabbedPanels1['defaultTab'].value = 1;

---

它正在工作。

您的意思是执行分配后，

TabbedPanels1.defaultTab

的值不是1吗？您是如何确认这一点的？是的，它没有赋值。您是如何确定该值没有更改的？（请注意，在进行分配之前，您正在调用

alert

。）这是为了更改html中选定的选项卡，而不是选择选项卡1。如果我从原型中分配值，它正在工作，但不是通过这个。要真正更改选项卡，您需要做的不仅仅是更改

defaultTab

的值。请注意，构造函数在首次将其值设置为0后修改

defaultTab

。（当构造函数调用

attachBehaviors

时，可能会进一步使用

defaultTab

），您需要在更改值时重复该处理；它不会完全自行发生。你应该把这个答案标记为你问题的答案。

TabbedPanels1['defaultTab'].value

TabbedPanels1['defaultTab'].value = 1;