Other Objects in JavaScript_Basics-JS Tutorial-php.cn

anchors[]; links[]; Link connection object
usage: document.anchors[[x]]; document.links[[x]]; ;
Document.anchors is an array , including all anchor tags in the document ( tags containing the name attribute), and a subscript is defined for each anchor tag starting from 0 according to the order in the document.
Document.links is also an array, containing all link tags in the document (including the tag of the href attribute and the tag in the tag segment), in order in the document, starting from 0 An index is defined for each connection tag.
If a tag has both name and href attributes, it is both an Anchor object and a Link object.
In IE, if you add the "id="..."" attribute to the tag, the object will be assigned an identity (ID). When calling this object, you only need to use "” That’s it. Many document components can use this method to assign IDs, but be careful that no two IDs are the same.
anchors and links are arrays and have array properties and methods. A single Anchor object has no properties; the properties of a single Link object are shown below.

Attributes
protocol; hostname; port; host; pathname; hash; search; href are the same as location objects.
target returns/specifies the target window (string) of the connection, which is the same as the target attribute in the tag.
Event
onclick; onmouseover; onmouseout; onmousedown; onmouseup

applets[] Java applet object It is an array that contains all Applet objects (Java applet) in the document. As an array, there are array properties and methods. Regarding the properties and methods of a single Applet object, I quote: "The Applet object inherits all public properties and methods of the Java applet." (English original sentence: The Applet object inherits all public properties of the Java applet./The Applet object inherits all public methods of the Java applet.) Because I hate Java applets, I am not interested in its "public" and "private" issues, so I did not discuss them.
embeds[] Plug-in object It is an array that contains all plug-ins ( tags) in the document. Because each plug-in is different, each Embed object also has different properties and methods.
forms[]; Form form object document.forms[] is an array that contains all the forms in the document (

). To reference a single form, you can use document.forms[x], but generally speaking, people will do this: add the "name="..."" attribute to the

). To reference a single image, you can use document.images[x]. If a picture contains the "name" attribute, that is, a picture is defined in the format of " ", you can use " document.images['...']" method to reference pictures. In IE, if a picture contains the ID attribute, that is, a picture is defined in the format of "<img alt="Other Objects in JavaScript_Basics" >", it can be used directly "<img alt="Other Objects in JavaScript_Basics" >" to reference the image. <img alt="Other Objects in JavaScript_Basics" ><imageid>The attributes of a single Image object name; src; lowsrc; width; height; vspace; hspace; border. These attributes are the same as the attributes of the same name in the tag. Same. In Netscape, except for the src attribute, other attributes (almost all) cannot be changed. Even if they are changed, the effect will not be displayed in the document. The most useful of these attributes is src. By assigning a value to the src attribute. , you can change the image in real time. Event<img alt="Other Objects in JavaScript_Basics" >onclick Image object not displayed in the document Image object not displayed in the document is defined with var statement: var myImage = new Image(); or var myImage = new Image( ); Then the myImage variable can be treated like a normal Image object, but since it is not displayed in the document. , the following attributes: lowsrc, width, height, vspace, hspace, border are of no use. Generally, this kind of object has only one use: preloading the image, because when the src attribute of the object is assigned, the entire document. Reading and JavaScript execution are paused, allowing the browser to concentrate on reading images. After pre-reading the image, there is a copy of the image in the browser's cache. When it is time to actually put the image into the document, the image can be displayed immediately. There are often some image connections in today's web pages. When the mouse points to it, the image is changed to another image. They all pre-read the image first. JavaScript example of pre-reading images var imagePreload = new Image(); imagePreload.src = '001.gif'; imagePreload.src = '002.gif'; imagePreload.src = '003.gif'; The above example is suitable for pre-reading a small number of images. function imagePreload() { var imgPreload = new Image(); for (i = 0; i imgPreload.src = arguments[i ]; } } imagePreload('001.gif', '002.gif', '003.gif', '004.gif', '005.gif'); The above example is suitable for pre-reading a large number of pictures.</imageid>