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Introduction to Dom and introduction to Wu Zetian

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Introduction to Dom and introduction to Wu Zetian


On a webpage, objects that comprise pages (or documents) are organized in a tree structure.

The top level of the page is included in the Javascript treats every item in the document tree as an object, which can be manipulated using javascript. The standard Model used to represent objects in a Document is called DOM (Document Object Model ).



Document Object set




 

 
   
   
 
    Integration 
    Description 
   
 
   
 
    All [] 
    Provides access to all HTML elements in the document. 
   
 
   
 
    Anchors [] 
    Returns a reference to all Anchor objects in the document. 
   
 
   
 
    Applets 
    Returns a reference to all the Applet objects in the document. 
   
 
   
 
    Forms [] 
    Returns reference to all Form objects in the document. 
   
 
   
 
    Images [] 
    Returns a reference to all Image objects in the document. 
   
 
   
 
    Links [] 
    Returns reference to all Area and Link objects in the document. 
   
 
  

 








    var doc = document.forms;     document.write(doc.length); 




Obtain the array of All form forms on the page and write the length of the form array on the page, which is 2



Document Object Attributes






 

 
   
   
 
    Genus 
    Description 
   
 
   
 
    Body 
    
Provides direct access to the <body> element.
For documents that define a framework set, this attribute references the <frameset> of the outermost layer.
 
   
 
   
 
    Cookie 
    Sets or returns all cookies related to the current document. 
   
 
   
 
    Domain 
    Returns the Domain Name of the current document. 
   
 
   
 
    LastModified 
    Returns the date and time when the document was last modified. 
   
 
   
 
    Referrer 
    Returns the URL of the document that loads the current document. 
   
 
   
 
    Title 
    Returns the title of the current document. 
   
 
   
 
    URL 
    Returns the URL of the current document. 
   
 
  

 







    var expireDate = new Date();    expireDate.setMonth(expireDate.getMonth()+6);        var userName = document.getElementById("nameField").value;    document.cookie = "userName=" + userName + ";expires=" + expireDate.toGMTString();
Set browser cookies







Document Object Method






 

 
   
   
 
    Method 
    Description 
   
 
   
 
    Close () 
    Close the output stream opened using document. open () and display the selected data. 
   
 
   
 
    GetElementById () 
    Returns a reference to the first object with the specified id. 
   
 
   
 
    GetElementsByName () 
    Returns a set of objects with the specified name. 
   
 
   
 
    GetElementsByTagName () 
    Returns an object set with the specified tag name. 
   
 
   
 
    Open () 
    Open a stream to collect output from any document. write () or document. writeln () method. 
   
 
   
 
    Write () 
    Write HTML expressions or JavaScript code to the document. 
   
 
   
 
    Writeln () 
    It is equivalent to the write () method. The difference is that a line break is written after each expression. 
   
 
  

 







    document.getElementById("days")
Obtain the HTML object with the id of days.





Note: In the preceding methods, getElementById, getElementsByName, and getElementsByTagName are commonly used to access page elements.


GetElementById returns a single object. getElementsByName indicates the set of elements obtained based on name. getElementsByTagName indicates the set of elements obtained based on tag name.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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