共用方式為

<var> (JavaScript)

  • 發行項

Note

This article applies to Visual Studio 2015. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Specifies documentation information for a variable.

Syntax

<var type="ValueType" integer="true|false"
    domElement="true|false" mayBeNull="true|false"
    elementType="ArrayElementType" elementInteger="true|false"
    elementDomElement="true|false" elementMayBeNull="true|false"
    helpKeyword="keyword" locid="descriptionID">description
</var>

Parameters

type Optional. The data type of the variable. The type can be one of the following:

  • An ECMAScript language type that's in the ECMAScript 5 specification, such as Number and Object.

  • A DOM object, such as HTMLElement, Window, and Document.

  • A JavaScript constructor function.

    integer Optional. If type is Number, specifies whether the variable is an integer. Set to true to indicate that the variable is an integer; otherwise, set to false. This attribute is not used by Visual Studio to provide IntelliSense information.

    domElement Optional. This attribute is deprecated; the type attribute takes precedence over this attribute. This attribute specifies whether the documented variable is a DOM element. Set to true to specify that the variable is a DOM element; otherwise, set to false. If the type attribute is not set and domElement is set to true, IntelliSense treats the documented variable as an HTMLElement when performing statement completion.

    mayBeNull Optional. Specifies whether the documented variable can be set to null. Set to true to indicate that the variable can be set to null; otherwise, set to false. The default value is false. This attribute is not used by Visual Studio to provide IntelliSense information.

    elementType Optional. If type is Array, this attribute specifies the type of the elements in the array.

    elementInteger Optional. If type is Array and elementType is Number, this attribute specifies whether the elements in the array are integers. Set to true to indicate that the elements in the array are integers; otherwise, set to false. This attribute is not used by Visual Studio to provide IntelliSense information.

    elementDomElement Optional. This attribute is deprecated; the elementType attribute takes precedence over this attribute. If type is Array, this attribute specifies whether the elements in the array are DOM elements. Set to true to specify that the elements are DOM elements; otherwise, set to false. If the elementType attribute is not set and elementDomElement is set to true, IntelliSense treats each element in the array as an HTMLElement when performing statement completion.

    elementMayBeNull Optional. If type is Array, specifies whether the elements in the array can be set to null. Set to true to indicate that the elements in the array can be set to null; otherwise, set to false. The default value is false. This attribute is not used by Visual Studio to provide IntelliSense information.

    helpKeyword Optional. The keyword for F1 Help.

    locid Optional. The identifier for localization information about the variable. The identifier is either a member ID or it corresponds to the name attribute value in a message bundle defined by OpenAjax metadata. The identifier type depends on the format specified in the <loc> tag.

    description Optional. A description of the variable.

Example

The following code example shows how to use the <var> element.

/// <var>A rectangle that has a width of 5.</var>
var Rectangle = {
    /// <field type = 'Number'>The width of the rectangle.</field>
    wid: 5,
    /// <field type = 'Number'>The length of the rectangle.</field>
    len: 0,
    /// <field type='Number'>Returns the area of the rectangle.</field>
    getArea: function (wid, len) {
        return len * wid;
    }
}

See Also

XML Documentation Comments