In jquery, the eq() method is used to return the element with the specified index number of the selected element. The syntax is "$(selector).eq(index)"; the value of the parameter "index" is Integer, used to specify the index number of the element, which can be negative (the index will be calculated from the end of the selected element). Note that index numbers start with 0, so the index number of the first element is 0 (not 1).

The operating environment of this tutorial: windows7 system, jquery3.6.1 version, Dell G3 computer.

jquery eq() method

The eq() method is used to return the element with the specified index number of the selected element.

Syntax:

$(selector).eq(index)

• index: Required. Specifies the index of the element, which can be an integer or a negative number. If a negative number is used, the index will be calculated from the end of the selected element.

Note: The index number (index) starts from 0, so the index number of the first element is 0 (not 1).

Usage Example

Example 1:Select the second

element (index number is 1)

	
		
		
		
	

	

		
欢迎来到我的主页
		
我的名字叫Donald (索引号为 0).
		
Donald Duck (索引号为 1).
		
我住在 Duckburg (索引号为 2).
		
我最好的朋友是 Mickey (索引号为 3).

	

Example 2: Use a negative number to return the second

element from the end of the selected element.

	
		
		
		
	

	

		
欢迎来到我的主页
		
我的名字叫Donald (索引号为 0).
		
Donald Duck (索引号为 1).
		
我住在 Duckburg (索引号为 2).
		
我最好的朋友是 Mickey (索引号为 3).

	

Example 3:

If the element cannot be found based on the specified index parameter, this method constructs an jQuery object, length property is 0.

	
		
		
		
	

	

		
欢迎来到我的主页
		
我的名字叫Donald (索引号为 0).
		
Donald Duck (索引号为 1).
		
我住在 Duckburg (索引号为 2).
		
我最好的朋友是 Mickey (索引号为 3).

	

Here, the background without the p element will turn yellow because of the sixth p element indicated by .eq(5).

[Recommended learning: jQuery video tutorial, web front-end】

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