How to merge two strings into a new string in javascript

JavaScript is a widely used scripting language used to create interactive user interfaces for web pages and other web applications. Merging strings is a common task during web application development. At the same time, when we need to merge two different strings, sometimes they may have some different characters, and we need to find a way to merge them into a new string.

In JavaScript, we can use many different methods to merge strings. One way is to use the ' ' operator. The ' ' operator is used to concatenate two strings together, for example:

var str1 = "Hello";
var str2 = "world!";
var str3 = str1 + " " + str2;
console.log(str3); // 输出 "Hello world!"

In the above example, we first store the string "Hello" in the variable str1, and then Store the string "world!" in variable str2. Next, we concatenate these two strings together using the ' ' operator, which creates a new string "Hello world!" and finally stores it in the variable str3. Finally, we use console.log() to output the string "Hello world!" to the console.

However, what should we do if we want to merge two strings into a new string, but there are different characters in the two strings? One way is to use the string method concat() in JavaScript. concat() The method can concatenate multiple strings together and concatenate all strings into a new string. For example:

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

In the above example, the string "hello" is stored in the variable str1, the string "world" is stored in the variable str2, and the string "!" is stored in variable str3. Then, we use the concat() method to concatenate these three strings together, concatenate them into a new string "hello world!", and store it in the variable str4 middle. Finally, we output the value of variable str4 to the console.

But what should you do if you want to merge two strings together, but there are some different characters in the two strings? At this time we can use the replace() method to complete string replacement. replace() method allows us to find a specific character in a string and replace it with a new character. For example:

var str1 = "Hello, world!";
var str2 = "world";
var str3 = "universe";
var newStr = str1.replace(str2, str3);
console.log(newStr); // 输出 "Hello, universe!"

In the above example, we first declare a string variable named str1, which contains the string "Hello, world!". Next, we declare two new string variables, str2 and str3. The variable str2 contains one substring "world" and the variable str3 contains another substring "universe". We then use the replace() method to find the str2 substring in str1 and replace it with the str3 subcharacter string. Finally, we output the value of the newStr variable to the console.

In this example, we successfully replaced "world" in the str1 string with "universe" and stored the result in the newStr variable.

In general, whether we use the ' ' operator, the concat() method or the replace() method, it can help us merge two objects in JavaScript. string. Regardless of whether the two strings are the same or there are some different characters, we can use these methods to create a new string.

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