jquery removes specified string

In the process of front-end development, we often need to process string-related operations. Removing a specified string is a common operation. Using jQuery, a commonly used JavaScript library in the front-end, you can easily remove the specified string.

The following will introduce two common methods of using jQuery to remove specified strings:

Method 1: Use the replace() method

The replace() method in jQuery can be used For replacing the specified characters, strings and regular expressions in the string, by passing in the string and regular expression as parameters, the specified substring can be replaced with a new character or string, thereby achieving string removal.

The following is a simple example that demonstrates how to use the replace() method to delete a specified substring from a string:

let originalString = "Hello, world!";

let deletedString = originalString.replace("world", "");

console.log(deletedString); // Hello, !

In the above example, we first define a character String variable originalString and assign it the value "Hello, world!". We replace the "world" substring in this string with the empty string ("") and store the result in the variable deletedString. Finally, output the result of deletedString in the console, that is, "Hello, !". You can see that the "world" substring is successfully deleted from the original string.

It should be noted that the above example can only delete the specified string that appears once. If you need to delete all the specified substrings in the string, you need to use regular expressions and set the global flag (g).

For example, to remove all spaces in a string:

let originalString = "Hello,   world!   ";

let deletedString = originalString.replace(/s+/g, "");

console.log(deletedString); // Hello,world!

In the above example, we defined a string variable originalString, which contains multiple consecutive spaces . By using the regular expression "/s /g" we match all spaces within it and replace them all with an empty string by passing it as the second argument. Finally, the result of deletedString is output in the console, that is, "Hello, world!".

Method 2: Use the split() and join() methods

In addition to using the replace() method, we can also use the split() and join() methods to implement the specified string delete. Among them, the split() method is used to split the string from the specified character or string into an array, while the join() method is to connect the elements in the array with the specified character or string to generate a new string.

The following is an example of using the split() and join() methods to delete a specified string:

let originalString = "Hello, world!";

let deletedString = originalString.split("world").join("");

console.log(deletedString); // Hello, !

In the above example, we first define a string variable originalString, and assign it the value "Hello, world!". We use the split() method to split the string into an array with "world" as the delimiter, and use the join() method to connect the elements in the split array with an empty string. The final result is stored in the variable deletedString. Finally, the result of deletedString is output in the console, that is, "Hello, !", which is the same as the result of using the replace() method.

It should be noted that the use of split() and join() methods can handle the situation of multiple specified strings, for example:

let originalString = "Hello, my world! This is my world!";

let deletedString = originalString.split("my").join("");

console.log(deletedString); // Hello,  world! This is !

In the above example, we use the original characters All "my" substrings in the string are replaced with empty strings, and the result is "Hello, world! This is!".

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