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[Jquery] The difference between $$() $(document) in jQuery

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Posted on 2/14/2019 4:19:05 PM | | |
$ is a special symbol specific to jquery, and it can be said that all calls to jquery functions start with $
$() represents a selector in jquery, fill in certain expressions in parentheses to select the element you want, jquery's selector not only follows CSS expressions well, but also provides some more personalized selection methods, such as $("div li:nth-child(2))") is selected as the second li element in the div.
For more information on the use of selectors, you can check out the jquery API on Baidu
$(document) is a selector that selects a collection of all elements of the entire HTML.
$(function(){..}) document.ready event, that is, after all elements of the page are ready, this method is executed before loading the page





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