如何创建格式化的 javascript 控制台日志消息

Try this:

console.log("%cThis will be formatted with blue text", "color: blue");

Quoting the docs,

You use the %c format specifier to apply custom CSS rules to any string you write to the Console with console.log() or related methods.

Source: https://developers.google.com/web/tools/chrome-devtools/console/console-write#styling_console_output_with_css

Yes, you can format the console.log() with something like this:

console.log("%cExtra Large Yellow Text with Red Background", "background: red; color: yellow; font-size: x-large");

Note the %c preceding the text in the first argument and the style specifications in the second argument. The text will look like your example.

See Google's "Styling Console Output with CSS" or FireBug's Console Documentation for more details.

The documentation links also include some other neat tricks like including object links in a console log as well.

From Google's website: site

console.log("%cThis will be formatted with large, blue text", "color: blue; font-size: x-large");

You can also format substrings.

var red = 'color:red';
var blue = 'color:blue';
console.log('%cHello %cWorld %cfoo %cbar', red, blue, red, blue);

Just extending other answers and you can reuse the existing css style of selector, class, element. Try this in SO console window.

const customLog = (message, cssSelector) =>
console.log(
`%c${message}`,
Object.entries(getComputedStyle(document.querySelector(cssSelector)))
.map(([k, v]) => `${k}:${v}`)
.join(";")
);


customLog("Hello StackOverflow", "#question-header > div > a");


customLog("Hello StackOverflow", "strong");


customLog("Hello StackOverflow", "a");