jquery change string

In front-end development, processing strings is a very common operation, and the jQuery library provides some practical methods to change strings. This article will introduce some of the most common jQuery string manipulation methods and how to use them.

1. String concatenation - concat()

String concatenation is the process of concatenating two or more strings to form a new string, and jQuery The concat() method can achieve this operation. The syntax of this method is as follows:

var str1 = "hello";
var str2 = "world";
var str3 = str1.concat(str2);
console.log(str3); // 输出 "helloworld"

In the above example, the concat() method is used to convert the two string variables str1 and str2 Concatenate and get a new string str3. The concat() method can also accept multiple parameters, the following example demonstrates this:

var str1 = "hello";
var str2 = "world";
var str3 = "!";
var str4 = str1.concat(str2, str3);
console.log(str4); // 输出 "helloworld!"

2. String splitting - split()

Sometimes we need A common way to split a string into multiple substrings is to use the split() method in JavaScript, which can also be used in jQuery. The syntax of the split() method is as follows:

var str = "apple,orange,banana";
var arr = str.split(",");
console.log(arr); // 输出 ["apple", "orange", "banana"]

In the above example, the string str is split using , characters as delimiters, and a string containing three characters is obtained. String arrayarr of elements.

3. String replacement - replace()

String replacement refers to replacing the specified string or regular expression matching result in the string with a new substring the process of. In jQuery, you can use the replace() method to replace strings. The syntax of the replace() method is as follows:

var str = "hello world";
var newStr = str.replace("world", "jQuery");
console.log(newStr); // 输出 "hello jQuery"

In the above example, replace the substring world in the string str with jQuery , got a new string newStr.

4. String deletion - slice()

Sometimes we want to delete certain characters or substrings in a string. One way is to use JavaScript in slice() method, which can also be used in jQuery. The syntax of the slice() method is as follows:

var str = "hello world";
var newStr = str.slice(0, 5); // 从位置 0 开始截取到位置 5（不包括位置 5）
console.log(newStr); // 输出 "hello"

In the above example, the slice() method is used to intercept the first five characters from the string str and obtain a new stringnewStr.

5. String case conversion - toLowerCase() and toUpperCase()

When processing strings, sometimes it is necessary to convert letters into uppercase or lowercase. jQuery provides two methods, toLowerCase() and toUpperCase(), which can realize string case conversion. The syntax of these two methods is as follows:

var str = "Hello World";
var newStr1 = str.toLowerCase();
var newStr2 = str.toUpperCase();
console.log(newStr1); // 输出 "hello world"
console.log(newStr2); // 输出 "HELLO WORLD"

In the above example, the string str is converted into lowercase and uppercase respectively, and two new strings newStr1# are obtained. ## and newStr2.

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