what is dollar sign in jquery

The dollar sign in jquery is an alias for jQuery, which represents the jQuery object; the basic syntax of jquery is "$(selector).action()", where the dollar sign $ defines jQuery, and selector represents the selector used for "Query" and "find" HTML elements, action() performs operations on elements.

The operating environment of this tutorial: Windows 10 system, jquery3.2.1 version, Dell G3 computer.

What is the dollar sign in jquery?

In jQuery, the dollar sign ($) is just an alias for jQuery, which represents a jQuery object. For example, $("div") and jQuery("div") are equivalent.

Note two points:

1. All functionality of jQuery can be guaranteed even without using $.

2. In order to avoid conflicts with other javascript libraries, you can release jQuery's control of the $ variable and specify a new custom name for the jQuery variable. For example:

After executing var jq=$.noConflict();, $ will no longer control the current jQuery, but will be transferred to the jq variable. At this time, jq("div") and jQuery(" div") are equivalent.

Related introduction:

jQuery syntax is to select HTML elements and perform certain operations on the selected elements.

Basic syntax: $(selector).action()

• Dollar sign definition jQuery

• Selector (selector) "Query" and "Find" HTML elements

• jQuery's action() performs operations on elements

Example:

• $(this).hide() - Hide the current element

• $("p").hide() - Hide all

  elements

• $("p.test").hide() - Hide all

  elements with class="test"

• $ ("#test").hide() - Hide elements with id="test"

Recommended learning: "jQuery Video Tutorial"

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