Introduction to jquery general methods Getting started reference_jquery

1. event.preventDefault(): Prevent an event from happening. For example, when a link is clicked, it will jump to the linked page. If you want to avoid this function, you can use this method. For example:

Copy code The code is as follows:

　Click Baidu
　<script> <br>　$(document).read(function(){ <br>　　$("a").click(function(event){ <br>　　　　　event.preventDefault(); //The effect is that when the above link is clicked, the page remains unchanged. <br>　　}) <br>　　}) <br>　</script> 2. The hide() method, as the name suggests, is a hidden method. If you add $(this).hide() below in the above example, the four words "Baidu" will disappear when you click on it. If you add $(this).hide("slow"), you can find that the four words "Baidu" will slowly disappear when you click on them.
3. How to use callback. callback is the so-called callback function, which is executed only after the parent function is executed. Examples are as follows:

(1) When the callback function has no parameters, directly $.get("dd.html",mycallback);
(2) When the callback function includes parameters, $.get("dd.html ",function(){
mycallback(param1,param2);
})
) method is passed as the second parameter of the get() method to execute the get() method.
4. Usage of jquery(selector,[context]):
1. $('div.foo').click(function(){
$('span',this).addClass( 'bar');
})
The html code is
div class="foo1">Haha3