Detailed explanation of common attribute methods of document objects in DOM based on js-JS Tutorial-php.cn

Detailed explanation of common attribute methods of document objects in DOM based on js

高洛峰

Release： 2016-12-08 14:35:35

Original

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-----Introduced

Every HTML document loaded into the browser will become a Document object.

Document objects allow us to access all elements in an 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 selected 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>

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2 document.createElement() Create element node.

<!DOCTYPE html>
<html>
<!DOCTYPE html>
<head>
</head>
<body>
  <p>hello world</p>
   
<script>
  var a = document.createElement(&#39;hr&#39;);
  document.body.appendChild(a)
 
 
</script>
</body>
</html>

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3 document.createAttribute() Create 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>

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4 document.createTextNode() Create a text node.

<!DOCTYPE html>
<html>
<!DOCTYPE html>
<head>
</head>
<body>
  <p>hello world</p>
 
<script>
  var a = document.createTextNode(&#39;hahahah&#39;);
  document.body.appendChild(a)
 
 
</script>
</body>
</html>

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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>
<!DOCTYPE html>
<head>
</head>
<body>
  <p>hello world</p>
 
<script>
  document.write(&#39;hahahh&#39;)
 
 
</script>
</body>
</html>

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