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What does > in jquery mean?

青灯夜游Original: 2022-02-28 15:49:532264browse

In jquery, ">" is a child element selector, which can only select child elements of a certain element; the syntax is "$("E > F")", where E is the parent element, and F is a sub-element, which means that all sub-elements F under the E element are selected.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

In jquery, ">" refers to a sub-element selector, which is a type of hierarchical selector.

Child element selector (E>F)Only the child elements of a certain element can be selected, where E is the parent element and F is the child element, where E> What F represents is that all sub-elements F under the E element are selected.

Syntax:

$("E > F")

All selectors in jQuery begin with a dollar sign: $().

Return value: Return the matching result set

Example:

<!DOCTYPE html>
<html>
	<head>
		<script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
		<script>
			$(document).ready(function() {
				$("#main > *").css("border", "3px double red");
			});
		</script>
		<style>
			body {
				font-size: 14px;
			}

			span#main {
				display: block;
				background: yellow;
				height: 110px;
			}

			button {
				display: block;
				float: left;
				margin: 2px;
				font-size: 14px;
			}

			div {
				width: 90px;
				height: 90px;
				margin: 5px;
				float: left;
				background: #bbf;
				font-weight: bold;
			}

			div.mini {
				width: 30px;
				height: 30px;
				background: green;
			}
		</style>
	</head>
	<body>
		<span id="main">
			<div></div>
			<button>Child</button>
			<div class="mini"></div>
			<div>
				<div class="mini"></div>
				<div class="mini"></div>
			</div>
			<div><button>Grand</button></div>
			<div><span>A Span <em>in</em> child</span></div>
			<span>A Span in main</span>
		</span>
	</body>
</html>

Analysis:

$ ("#main > *").css("border", "3px double red");

will match the child elements in the span element and must be the first in the child element collection An element, the following are the matching elements (purple)

What does > in jquery mean?

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

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