What is jquery
jquery is a simple and fast JavaScript library. It has unique chain syntax, short and clear multi-function interface, efficient and flexible CSS selector, and can extend the CSS selector, with convenient plug-in extension mechanism and rich plug-ins. It is another excellent JavaScript code library after Prototype. It can be used to simplify event processing, HTML document traversal, Ajax interaction and animation to quickly develop websites.
1. eq() method
1. Definition: This method can obtain elements matching the corresponding position index on the element set.
2. Usage: The position index of the element on the matching element set starts from 0.
3. Use syntax
eq(index | -index)
4. Use parameters
index: integer (positive number), select the element with index value index, and the index value starts from 0.
-index: integer (negative number), counting from the last element in the collection element, starting from 1.
5. Examples of use
$(document).ready(function(){
$("p").eq(1);
});2.:eq() selector
1. Definition: This selector matches an element with a given index value.
2. Usage: The position index of the element starts from 0.
3. Use syntax
$( " :eq(index)" )
You can use .eq(index) directly,
If you want to use the eq selector, you must write it as: eq('+index+') so that the obtained index is the variable.
4. Use parameters
index: counting starting from 0
5. Examples of use
$("ul li:eq(3)") // The index position of the element starts counting by 0, so the 3 here is actually the 4th element$("ul").find("li").eq(3) //usejqueryTraversal methodeq()Additional introduction
The `eq()` method is the method used in jQuery to select elements. It can be used to select an element that specifies the index position, and the index starts from 0.
Here are some common examples of using the `eq()` method:
1. Select the first element:
$('li').eq(0)
2. Select the last element:
$('li').eq(-1)
3. Select the penultimate element:
$('li').eq(-2)
4. Select all elements of even index positions:
$('li').filter(function(index) {
return index % 2 === 0;
})Use the `eq()` method to easily implement the above example:
$('li').eq(function(index) {
return index % 2 === 0;
})It is worth noting that the `eq()` method returns a jQuery object, so chain operations can be continued.
For example, add a style to the selected element:
$('li').eq(0).addClass('selected');
This is the article about the use examples of the eq() method in jQuery. For more related contents of the use of eq() method in jQuery, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!