Let me summarize the process of Js operation DOM object. I took a look at the speed of various methods of selecting elements. The native method is nearly 8 times faster than the jQUERY block, and IE8 is the slowest. , IE9 is three times faster than IE8.
Method to select document elements:
1. Select elements by ID (getElementById)
1) Usage method: document. getElementById("domId")
Where, domId is the id attribute value of the element to be selected
2) Compatibility: IE browsers that are lower than IE8 version do not distinguish the implementation of the getElementById method The element ID number is case-sensitive, and elements matching the name attribute will be returned.
2. Select elements by name (getElementsByName)
1) Usage method: document.getElementsByName("domName")
Among them, domName is the name attribute value of the element to be selected
2 ) Description: a. The return value is a nodeList collection (different from Array)
b. Unlike the ID attribute, the name attribute is only valid in a few DOM elements (form form, form element, iframe, img). This is because the name attribute was created to facilitate submitting form data. Therefore, the corresponding dom object can be referenced through document.domName 3) Compatibility: Elements with matching ID attribute values in IE will also be returned together
3. Select elements by tag name (
getElementsByTagName
) 1) Usage method: element.getElementsByTagName("tagName") Among them, element is a valid DOM element (including document)
tagName is the tag name of the DOM element
2) Description : a. The return value is a nodeList collection (different from Array)
b. This method can only select descendant elements of the element that calls this method.
C. Tagname does not distinguish between la between? For example: the images, forms, and links attributes of document point to the collection of ,
The above is the detailed content of Js process of operating DOM objects. For more information, please follow other related articles on the PHP Chinese website!

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