Analysis of the role of $ symbol in jQuery
This article mainly introduces the analysis of the role of the $ symbol in jQuery. It has a certain reference value. Now I share it with you. Friends in need can refer to it
$ symbol overall It has two functions:
1. Called as a general function: $(param)
(1), the parameter is a function: When the DOM is loaded, execute this callback function
$(function(){//Execute after the DOM is loaded
//Code
})
(2), the parameter is the selector string: find all matching tags and encapsulate them into jQuery objects
(3). The parameter is a dom object: encapsulate the dom object into a jQuery object
such as: $(this)
Note: The difference between jQuery objects and dom objects:
jQuery objects can use jQuery methods, but dom objects cannot!
$("li")[0] is a dom object, and then wrapped by $() $($("li")[0] ) returns a jQuery object, then You can use jQuery method
(4), the parameter is html tag string (less used): create a tag object and encapsulate it into a jQuery object
2. Use as an object: $.xxx()
Such as:
(1) $.each(): Traverse the array Or object
(2) $.trim(): Remove the spaces at both ends
The above is the entire content of this article, I hope it will be useful for everyone’s learning Help, please pay attention to the PHP Chinese website for more related content!
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