


Detailed explanation of javascript document object properties and method code examples
Every HTML document loaded into the browser will become a Document object. The Document object allows us to access all elements in the HTML page from scripts.
Properties
1 document.anchors Returns references to all Anchor objects in the document. There are also document.links/document.forms/document.images, etc.
2 document.URL Returns the url of the current document
3 document.title Returns the title of the current document
4 document.body Returns the body element node
Method
1 document.close() Closes the output stream opened with the document.open() method and displays the selection The data.
<!DOCTYPE html> <html> <head> <script> function createDoc() { var w=window.open(); w.document.open(); w.document.write("<h1>Hello World!</h1>"); w.document.close(); } </script> </head> <body> <input type="button" value="New document in a new window" onclick="createDoc()"> </body> </html>
2 document.createElement() Create an element node.
<!DOCTYPE html> <html lang="en"> <!DOCTYPE html> <head> </head> <body> <p>hello world</p> <script> var a = document.createElement('hr'); document.body.appendChild(a) </script> </body> </html>
3 document.createAttribute() Create an attribute node.
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to make a BUTTON element.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var btn=document.createElement("BUTTON"); document.body.appendChild(btn); }; </script> </body> </html>
4 document.createTextNode() Create a text node.
<!DOCTYPE html> <html lang="en"> <!DOCTYPE html> <head> </head> <body> <p>hello world</p> <script> var a = document.createTextNode('hahahah'); document.body.appendChild(a) </script> </body> </html>
5 document.getElementsByClassName() Returns a collection of all elements with the specified class name in the document as a collection of NodeList objects. The so-called NodeList object collection is a data format similar to an array. It only provides the length attribute, and the push and pop methods in the array are not provided.
6 document.getElementById() returns a reference to the first object with the specified id.
7 document.getElementsByName() returns a collection of objects with the specified name.
8 document.getElementsByTagName() returns a collection of objects with the specified tag name.
9 document.write() writes HTML expressions or JavaScript code to the document. Note: Using the write method after the HTML document is loaded will cause the write content to overwrite the original HTML document.
<!DOCTYPE html> <html lang="en"> <!DOCTYPE html> <head> </head> <body> <p>hello world</p> <script> document.write('hahahh') </script> </body> </html>
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