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What is the usage of substr function in jquery

青灯夜游Original: 2022-03-22 19:20:103233browse

In jquery, the substr function is used to intercept a substring of a specified number of characters starting from the specified subscript of a string. This function supports two parameters. The first parameter specifies the starting subscript for interception. The two parameters specify the number of characters; the syntax is "string object.substr(start,length)".

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

In jquery, the substr function is used to intercept a specified number of characters starting from the specified subscript of a string. This intercepted character can be called a "substring" or "substring". Its syntax The format is as follows:

stringObject.substr(start,length)

##ParameterDescriptionRequired. The starting index of the substring to be extracted. Must be a numeric value. If negative, this parameter declares the position from the end of the string. That is, -1 refers to the last character in the string, -2 refers to the second to last character, and so on. Optional. The number of characters in the substring. Must be a numeric value. If this parameter is omitted, the string from the beginning to the end of


start
length	stringObject is returned.

Return value:

A new string containing length characters starting from the start of stringObject (including the character pointed to by start). If length is not specified, the returned string contains characters from start to the end of the stringObject.

Example: intercept the string "Hello world!" starting from subscript 5, intercept 6 characters

<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<script src="js/jquery-1.10.2.min.js"></script>
		<script>
			$(document).ready(function() {
				var text=$("p").text();
				console.log(text.substr(5,6));
			});
		</script>
	</head>
	<body>

		<p>Hello world!</p>

	</body>
</html>

What is the usage of substr function in jquery

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