jquery is() method
Translation results：
is
英[ɪz] 美[ɪz]
vt.& vi. is (the third single form of be)
n .exist
jquery is() methodsyntax
Function: is() detects a set of matching elements based on a selector, element, or jQuery object, and returns true if at least one of these elements matches the given parameters.
Syntax: .is(selector)
Parameters:
| Parameter | Description |
| selector | String value, containing the selector expression of the matching element. |
Note: Unlike other filtering methods, .is() does not create a new jQuery object. Instead, it allows us to instrument the jQuery object without modifying its contents. This is often useful inside callbacks, such as event handlers.
jquery is() methodexample
<!DOCTYPE html>
<html>
<head>
<style>div { color:red; }</style>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<form><p><input type="checkbox" /></p></form>
<div></div>
<script>
var isFormParent = $("input[type='checkbox']").parent().is("form");
$("div").text("isFormParent = " + isFormParent);
</script>
</body>
</html>Click the "Run instance" button to view the online instance