Chrome内置的JavaScript控制台可以显示颜色吗?
我想要错误在红色,警告在橙色和控制台。log在绿色。这可能吗?
Chrome内置的JavaScript控制台可以显示颜色吗?
我想要错误在红色,警告在橙色和控制台。log在绿色。这可能吗?
当前回答
有一系列内置函数用于为控制台日志上色:
//For pink background and red text
console.error("Hello World");
//For yellow background and brown text
console.warn("Hello World");
//For just a INFO symbol at the beginning of the text
console.info("Hello World");
//for custom colored text
console.log('%cHello World','color:blue');
//here blue could be replaced by any color code
//for custom colored text with custom background text
console.log('%cHello World','background:red;color:#fff')
其他回答
下面是另一种方法(在Typescript中),它覆盖console.log函数并检查传递的消息,以便根据消息中的开始标记应用CSS格式。这个方法的一个好处是被调用者不需要使用一些包装console.log函数,他们可以坚持使用普通的console.log(),所以如果这个覆盖消失,该功能将恢复到默认的console.log:
// An example of disabling logging depending on environment:
const isLoggingEnabled = process.env.NODE_ENV !== 'production';
// Store the original logging function so we can trigger it later
const originalConsoleLog = console.log;
// Override logging to perform our own logic
console.log = (args: any) => {
if (!isLoggingEnabled) {
return;
}
// Define some tokens and their corresponding CSS
const parsing = [
{
token: '[SUCCESS]',
css: 'color: green; font-weight: bold;',
},
{
token: '[ERROR]',
css: 'color: red; font-weight: bold;',
},
{
token: '[WARN]',
css: 'color: orange; font-weight: bold;',
},
{
token: '[DEBUG]',
css: 'color: blue;',
},
];
// Currently only supports console.log(...) with a single string argument.
if (typeof args === 'string') {
const message: string = args;
let formattedArgs: string[] = [];
for (let i = 0; i < parsing.length; i += 1) {
const parser = parsing[i];
if (args.startsWith(parser.token)) {
formattedArgs = [`%c${message.substring(parser.token.length + 1, message.length)}`, parser.css];
break;
}
}
originalConsoleLog.apply(console, formattedArgs);
} else {
originalConsoleLog.apply(console, args);
}
};
使用示例:
console.log('[ERROR] Something went wrong!');
输出:
看看这个:
控制台动画,加上CSS
(function() {
var frame = 0;
var frames = [
"This",
"is",
"SPARTA!",
" ",
"SPARTA!",
" ",
"SPARTA!",
" ",
"SPARTA!",
" ",
"SPARTA!",
" ",
"SPARTA!"
];
var showNext = () => {
console.clear();
console.log(
`%c `,
"background: red; color: white; font-size: 15px; padding: 3px 41%;"
);
console.log(
`%c ${frames[frame]}`,
"background: red; color: white; font-size: 25px; padding: 3px 40%;"
);
console.log(
`%c `,
"background: red; color: white; font-size: 15px; padding: 3px 41%;"
);
setTimeout(
showNext,
frames[frame] === "SPARTA!" || frames[frame] === " " ? 100 : 1500
);
// next frame and loop
frame++;
if (frame >= frames.length) {
frame = 0;
}
};
showNext();
})();
https://jsfiddle.net/a8y3jhfL/
你可以在每一帧中粘贴ASCII来观看ASCII动画
从Chrome 60开始,他们删除了在编写console.info时使用蓝色文本的功能,并对控制台API做了很多改变。
如果你在es6模式中写一个字符串字面值,在console.log()中使用反勾号' '作为标识符(称为模板字符串),那么下面的方法可以为控制台输出着色。
console.log(`%cToday date=>%c${new Date()}`,`color:#F74C2F`, `color:green`);
// output :Today date (in red color) => Date (in green color)
如果你想给你的终端控制台上色,那么你可以使用npm包粉笔
npm i chalk
选项1
// log-css.js v2
const log = console.log.bind()
const css = (text, options) => {
let cssOptions = ''
for (let prop in options) {
const value = options[prop]
prop = camelCaseToDashCase(prop)
cssOptions += `${prop}: ${value}; `
}
return [`%c${text}`, cssOptions.trim()]
function camelCaseToDashCase(value) {
return value.replace(/[A-Z]/g, matched => `-${matched.toLowerCase()}`)
}
}
例子:
log(...css('Example =P', {
backgroundColor: 'blue',
color: 'white',
// fontFamily: 'Consolas',
fontSize: '25px',
fontWeight: '700',
// lineHeight: '25px',
padding: '7px 7px'
}))
选项2
我现在创建log-css.js https://codepen.io/luis7lobo9b/pen/QWyobwY
// log-css.js v1
const log = console.log.bind();
const css = function(item, color = '#fff', background = 'none', fontSize = '12px', fontWeight = 700, fontFamily) {
return ['%c ' + item + ' ', 'color:' + color + ';background:' + background + ';font-size:' + fontSize + ';font-weight:' + fontWeight + (fontFamily ? ';font-family:' + fontFamily : '')];
};
例子:
log(...css('Lorem ipsum dolor sit amet, consectetur adipisicing elit.', 'rebeccapurple', '#000', '14px'));