JavaScript·JavaScript 的对象属性 -- 追寻梦想＞编程乐园

Examples

xxx Examples to be supplied.

anchors property

Array of objects corresponding to named anchors (<A NAME=""> tags) in source order.

The anchors array contains an entry for each anchor in a document. For example, if a document contains three anchors, these anchors are reflected as document.anchors[0], document.anchors[1], and document.anchors[2].

To obtain the number of anchors in a document, use the length property: document.anchors.length.

Applies to

Examples

xxx Examples to be supplied.

bgColor property

RGB value of background color, expressed as a hexadecimal triplet. This property is the JavaScript reflection of the BGCOLOR attribute of the HTML BODY tag.

Applies to

Examples

xxx Examples to be supplied.

checked property

For checkbox, Boolean, false if not checked, true if checked. For radioButton, Boolean, false if not pressed, true if pressed.

Applies to

checkbox, radioButton

Examples

xxx To be supplied.

current property

URL of current page. xxx Not yet implemented in Beta 4.

Applies to

history

Examples

xxx Examples to be supplied.

defaultChecked property

For checkbox, Boolean property that indicates if the element is selected by default, by the CHECKED attribute. For radioButton, Boolean property that indicates if the element is selected by default, by the CHECKED attribute.

Applies to

checkbox, radioButton

Examples

xxx Examples to be supplied.

defaultSelected property

Boolean property that indicates if the option is selected by default, by the presence of the SELECTED attribute in the HTML OPTION tag.

Applies to

Examples

xxx Examples to be supplied.

defaultStatus property

For a window, the defaultStatus property reflects the default message displayed in the status bar at the bottom of the window. Do not confuse defaultStatus with status. The status property reflects a priority or transient message in the status bar, such as the message that appears when a mouseOver event occurs over an anchor.

Applies to

Examples

xxx Examples to be supplied.

defaultValue property

For text and textArea, string, the initial contents of the field.

Applies to

password, text, textArea

Examples

xxx Examples to be supplied.

E property

E is Euler's constant, the base of natural logarithms, roughly 2.718.

Applies to

Examples

xxx Examples to be supplied.

elements property (client)

Array of objects corresponding to form elements (such as checkbox, radioButton, and text objects) in source order.

The elements array contains an entry for each object in a form. For example, if a form has a text field, a radio button group, and a checkbox, these elements are reflected as formName.elements[0], formName.elements[1], and formName.elements[2].

Applies to

form

Examples

xxx Examples to be supplied.

fgColor property

RGB value of foreground (text) color, expressed as a hexadecimal triplet. This property is the JavaScript reflection of the FGCOLOR attribute of the HTML BODY tag.

Applies to

Examples

xxx Examples to be supplied.

forms property

Array of objects corresponding to named forms (<FORM NAME=""> tags) in source order.

The forms array contains an entry for each form object in a document. For example, if a document contains three forms, these forms are reflected as document.forms[0], document.forms[1], and document.forms[2].

You can refer to a form's elements by using the forms array. For example, you would refer to a text object named quantity in the second form as:

document.forms[1].quantity

You would refer to the value property of this text object as:

document.forms[1].quantity.value

To obtain the number of forms in a document, use the length property: document.forms.length.

Applies to

Examples

xxx Examples to be supplied.

frames property

Array of objects corresponding to child frame windows (<FRAMESET> tag) in source order.

The frames array contains an entry for each child frame in a window. For example, if a window contains three child frames, these frames are reflected as window.frames[0], window.frames[1], and window.frames[2].

To obtain the number of number of child frames in a window, use the length property: window.frames.length.

Applies to

Examples

xxx Examples to be supplied.

hash property

The anchor name following the # symbol.

Applies to

Examples

xxx Examples to be supplied.

host property

The hostname:port part of the location or URL.

Applies to

Examples

xxx Examples to be supplied.

hostname property

The hostname part of the location or URL.

Applies to

Examples

xxx Examples to be supplied.

href property

The entire URL as a JavaScript string.

Applies to

Examples

xxx Examples to be supplied.

index property

For radioButton, number, the ordinal number of the radioButton field, 0-based. For a select object option, the number identifying the position of the option in the selection, starting from zero.

Applies to

radioButton, selection

Examples

xxx Examples to be supplied.

lastModified property

A string containing the last-modified date.

Applies to

Examples

xxx Examples to be supplied.

length property

For a history object, the length of the history list. For a string object, the integer length of the string. For a radioButton object, the number of radio buttons in the object. For an anchors, forms, frames, links, or options array, the number of elements in the array.

For a null string, length is zero.

Applies to

applet, history, radioButton, string objects

anchors, forms, frames, links, options properties

Examples

xxx Example with history to be supplied.

If the string object mystring is "netscape", then mystring.length returns the integer 8.

If the current document contains five forms, then document.forms.length returns the integer 5.

linkColor property

RGB value for color of hyperlinks, expressed as a hexadecimal triplet.

Applies to

Examples

xxx Examples to be supplied.

links property

Array of objects corresponding to link objects (<A HREF=URL> tags) in source order.

The links array contains an entry for each link object in a document. For example, if a document contains three link objects, these links are reflected as document.links[0], document.links[1], and document.links[2].

To obtain the number of links in a document, use the length property: document.links.length.

Applies to

Examples

xxx Examples to be supplied.

LN2 property

LN2 is the natural logarithm of two, roughly 0.693.

Applies to

Examples

xxx Examples to be supplied.

LN10 property

LN10 is the natural logarithm of ten, roughly 2.302.

Applies to

Examples

xxx Examples to be supplied.

loadedDate property

xxx Description to be supplied. Not yet implemented in Beta 4.

Applies to

Examples

xxx Examples to be supplied.

location property

The full URL of the document.

Applies to

Examples

xxx Examples to be supplied.

method property

Value of METHOD attribute, "get" or "post".

Applies to

form

Examples

xxx Examples to be supplied.

name property

A string whose value is the same as the NAME attribute of the object. Note that for button, reset, and submit objects, this is the internal name for the button, not the label that appears onscreen.

Applies to

button, checkbox, form, password, radioButton, reset, submit, text, textArea

Examples

xxx Examples to be supplied.

options property

Array of objects corresponding to options in a selection object (<OPTION> tags) in source order.

The options array contains an entry for each option in a selection object. For example, if a selection object named musicStyle contains three options, these options are reflected as musicStyle.options[0], musicStyle.options[1], and musicStyle.options[2].

To obtain the number of options in a selection object, use the length property: objectName.options.length.

Applies to

Examples

xxx Examples to be supplied.

parent property

In a <FRAMESET> and <FRAME> relationship, the <FRAMESET> window.

Applies to

Examples

xxx Examples to be supplied.

pathname property

The file or object path name following the third slash.

Applies to

Examples

xxx Examples to be supplied.

PI property

Pi is the ratio of the circumference of a circle to its diameter, roughly 3.1415.

Applies to

Examples

xxx Examples to be supplied.

port property

The port number in a URL, if any; otherwise "".

Applies to

Examples

xxx Examples to be supplied.

protocol property

The initial substring up to and including the first colon, which indicates the URL's access method.

Applies to

Examples

xxx Examples to be supplied.

referrer property

xxx Description to be supplied.

Applies to

Examples

xxx Examples to be supplied.

search property

Any query string or form data after ?.

Applies to

Examples

xxx Examples to be supplied.

selected property

Boolean property that indicates the current selected state of an option in a select object.

Applies to

Examples

xxx Examples to be supplied.

selectedIndex property

xxx to be described

Applies to

Examples

xxx Examples to be supplied.

self property

The self property refers to the current window. Use the self property to disambiguate a window property from a form of the same name. You can also use the self property to make your code more readable.

Applies to

Examples

In the following example, self.status is used to set the status property. This usage disambiguate the status property of a window from a form called "status".

SQRT1_2 property

SQRT1_2 is the square root of one-half; equivalently, one over the square root of two, roughly 0.707.

Applies to

Examples

xxx Examples to be supplied.

SQRT2 property

SQRT2 is the square root of two, roughly 1.414.

Applies to

Examples

xxx Examples to be supplied.

status property

For a window, the status property reflects a priority or transient message in the status bar at the bottom of the window, such as the message that appears when a mouseOver event occurs over an anchor. Do not confuse status with defaultStatus. The defaultStatus property reflects the default message displayed in the status bar.

Applies to

Examples

Suppose you have created a JavaScript function called pickRandomURL() that lets you select a URL at random. You can use the onClick event handler of an anchor to specify a value for the HREF attribute of the anchor dynamically, and the onMouseOver event handler to specify a custom message for the window in the status property:

In the above example, the status property of the window is assigned to the window's self property, as self.status. As this example shows, you must return true to set the status property in the onMouseOver event handler.

target property

Window targeted for form response after the form has been submitted.

Applies to

form, link

Examples

xxx Examples to be supplied.

text property

String, reflection of the text after the <OPTION> tag.

Applies to

Examples

xxx Examples to be supplied.

title property

Current document title.

Applies to