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This article will explain in detail what are the jQuery interview questions, Xiaobian thinks it is quite practical, so share it for everyone to make a reference, I hope you can gain something after reading this article.

What is $() in jQuery library?

A: The $() function is another name for the jQuery() function, which at first glance is weird and makes jQuery code obscure. Once you get used to it, you'll love its simplicity. The () function is used to wrap any object into a jQuery object, and then you are allowed to call multiple different methods defined on the jQuery object. You can even pass a selector string into the $() function, which returns a jQuery object containing an array of all matching DOM elements. I've seen this question mentioned several times, and although it's very basic, it's often used to distinguish whether a developer understands jQuery or not.

There are 5 elements on the web page, how do I use jQuery to select them?

A: jQuery supports different types of selectors, such as ID selector, class selector, label selector. Since this question doesn't mention IDs and classes, you can use the tag selector to select all div elements. jQuery code: $("div"), which returns a jQuery object containing all five div tags.

What is $(document).ready()? Why use it?

A: The ready() function is used to execute code when the document enters the ready state. When the DOM is fully loaded (i.e. HTML is fully parsed and the DOM tree is built), jQuery allows you to execute code. The best thing about using $(document).ready() is that it works across all browsers, and jQuery helps you solve cross-browser puzzles.

What is the difference between JavaScript _window.onload and jQuery ready?

A: The main difference between the JavaScript _window.onload event and the jQuery ready function is that the JavaScript_window. onload event waits until all external resources, including large images, audio, and video, are fully loaded, in addition to waiting for the DOM to be created. If it takes a lot of time to load images and media content, users will experience significant delays in the execution of code defined on the_window.onload event.

The jQuery ready() function, on the other hand, executes faster by simply waiting for the DOM tree, rather than waiting for images or external resource loads. Another advantage of using jQuery $(document).ready() is that you can use it multiple times on a web page, and the browser will execute them in the order they appear in the HTML page, as opposed to onload technology, which can only be used in a single function. Given this benefit, it is better to use the jQuery ready() function than the JavaScript _window.onload event.

What is each() function in jQuery? How do you use it?

A: The each() function is like an Iterator in Java, allowing you to iterate over a collection of elements. You can pass a function to each() method, and the called jQuery object will execute the passed function on each of its elements.

What is the difference between $(this) and this in jQuery?

$(this) returns a jQuery object on which you can call multiple jQuery methods, such as text() for text, val() for value, and so on. And this represents the current element, which is one of JavaScript keywords that represents the current DOM element in context. You cannot call jQuery methods on it until it is wrapped in a $() function, such as $(this).

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