nodejs console.log does not wrap lines

In Node.js, using the console.log() function to output information is a common operation. Normally, each call to the console.log() function will output one line of data and automatically wrap the data. But sometimes we need to output multiple information on the same line, instead of starting a new line every time we call the console.log() function. In this case, we need to modify the default behavior of the console.log() function.

In Node.js, the method to modify the default behavior of the console.log() function is very simple. You only need to pass in some specific parameters when calling the console.log() function. Below we introduce four methods of how to implement console.log() output without line breaks in Node.js.

Method 1: Use process.stdout.write() function

In Node.js, the default object of console output is process.stdout, so we can directly call process.stdout .write() function to output console information, thereby achieving the effect of console.log() function output without line breaks. It should be noted that the parameter types of the process.stdout.write() function and the console.log() function are different, and the information to be output needs to be converted into a string type.

Sample code:

process.stdout.write('这是一行');
process.stdout.write('不换行');

Method 2: Using ES6 template string

In Node.js, you can use ES6 template string syntax to output information and pass The ${} expression introduces the required variables and expressions. Outputting information in the form of template strings not only simplifies code writing, but also allows multiple information to be output on the same line.

Sample code:

const name = 'Tom';
const age = 18;
console.log(`${name}今年${age}岁了`);

Method 3: Use the escape character of the console.log() function

In Node.js, the console.log() function is also supported To escape characters, you can use the escape character to move the cursor to the beginning of the line, thereby achieving the effect of console.log() function output without line breaks. It should be noted that when using the escape character, the string to be output must be concatenated into a string on the same line, and the console.log() function must be used to output it only once.

Sample code:

console.log('这是一行不换行');

Method 4: Use the end parameter of the process.stdout.write() function

In Node.js, process.stdout.write() The function also has an end parameter, which is used to customize the character at the end of the output. By default, it is a carriage return character and a newline character. By setting the end parameter to an empty string, you can achieve the effect of console.log() function output without line breaks.

Sample code:

process.stdout.write('这是一行');
process.stdout.write('不换行', '');

Summary

The four methods introduced above can all be used to change the console output to non-newline output in Node.js. In actual development Which method to choose depends on the specific needs and scenarios. It is worth noting that when a large amount of information needs to be output, using the console.log() function to output without line breaks will affect the readability of the console and may make the information difficult to distinguish. In this case, multiple console.log() functions can be used Output the information on the same line, or write the output content to a file.

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