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JavaScript is a scripting language that is Object-and event-driven and has security performance.
2.Grammarthe script in the HTML must be between the <script> and </script> tags.
scripts can be placed in HTML pages in the <body> and sections;
most cases are decentralized in the section, which is better than other code that is loaded for execution.
Cases:
<! DOCTYPE html>
<body>
my Web page
<p id= "Demo" > a paragraph </p>
<button type= "button" onclick= "MyFunction ()" > try </button>
<script> function MyFunction ()
{
document.getElementById ("Demo"). Innerhtml= " my first JavaScript function ";
}
</script>
</body>
2.1 InnerHTMLInnerHTML in JS is bidirectional: Gets the contents of an object or inserts content into an object .
Grammar:
Htmlelementobject.innerhtml=text
Cases:
<div id= "AA" > this is content </div>
available through document.getElementById (' AA '). InnerHTML to get ID to be AA the embedded content of the object;
You can also insert content on an object:
document.getElementById (' abc '). Innerhtml= ' This is the content being inserted ';
inserts content into an object with an ID of ABC.
2.2Link Script fileFormat:
<script type= "Text/javascript" src= "Xxx.js" ></script>
Note: only scripts in the. js file do not contain HTML tags.
JQuery1: OverviewJquery is a tool library for JS
2:jquerythe functionHTML Element Selection
HTML Element Manipulation
CSS Actions
HTML Event Functions
JavaScript effects and animations
HTML DOM Traversal and modification
Ajax
Utilities
in addition, Jquery also offers a number of plugins. the most common are the jquery UI and the jquery easyui.
3: ReferenceJquery<script src= "Jquery-1.10.2.min.js" ></script>
4: Syntax$ (selector). Action ()
Example:$ (this). Hide ()- hides the current element
$ ("P"). Hide ()- hides all <p> elements
$ ("p.test"). Hide ()- hides all <p> elements of class= "test"
$ ("#test"). Hide ()- hides all elements of the id= "test"
5: About the entry function andJsthe Differencethe entry function for jquery:
$ (document). Ready (function () {
Execute Code
});
Or
$ (function () {
Execute Code
});
JavaScript Entry Functions :
Window.onload = function () {
Execute Code
}
the entry function for JQuery is to execute after all HTML tags (DOM) are loaded.
the window.onload event for JavaScript is to wait until all content, including external images, is loaded before it is executed.
6: Event Handling DifferencesEvent Source:
Js:document.getElementById ("id")
JQuery:$ ("#id")
Event:
Js:d Ocument.getelementbyid ("id"). onclick
JQuery: $ ("#id"). Click
Note:jQuery events do not take on
Event handlers:
Js:
document.getElementById ("id"). onclick = function () {// statement }
Jquery:
$ ("#id"). Click (function () {// statement });
(6th for reference, link I forgot, who knows the words to help me post)
JavaScript Instance reference: http://www.runoob.com/js/js-examples.html
jquery Example Reference: http://www.runoob.com/jquery/jquery-examples.html
JavaScript and jquery
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