Customize JavaScript&#s console.log-JS Tutorial-php.cn

Customize JavaScript&#s console.log

Mary-Kate Olsen

Release： 2024-09-23 06:19:07

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Customize JavaScript

If you ever wondered how to extend the default console.log() to i.e: prefix it with the current date-time:

// Store the default log method:
const _log = console.log;

// Override:
console.log = (...args) => {
    const prefix = `[${new Date().toLocaleString()}]`;
    if (typeof args[0] === "string") args[0] = `${prefix} ${args[0]}`
    else args.unshift(prefix);
    _log(...args);
};

// Examples:
console.log("Test"); // [Date Time] Test
console.log({a: "b"}); // [Date Time] {a: "b"}
console.log("Hello, %s!", "World"); // [Date Time] Hello, World!
console.log("Number: %i", 42); // [Date Time] Number: 42
console.log("%cStylized text", 'color: red'); // [Date Time] Stylized text

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Writing console.log is tedious, so instead of overriding the default behavior let's just create a log() function that uses console.log internally:

const log = (...args) => {
    const prefix = `[${new Date().toLocaleString()}]`;
    if (typeof args[0] === "string") args[0] = `${prefix} ${args[0]}`
    else args.unshift(prefix);
    console.log(...args);
};

// Examples:
log("Test"); // [Date Time] Test
log({a: "b"}); // [Date Time] {a: "b"}
log("Hello, %s!", "World"); // [Date Time] Hello, World!
log("Number: %i", 42); // [Date Time] Number: 42
log("%cStylized text", 'color: red'); // [Date Time] Stylized text

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Have fun logging, and don't forget about breakpoints ;)

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