node端实现console输出的不同颜色

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定义：

var styles = {
    'bold'          : ['\x1B[1m',  '\x1B[22m'],
    'italic'        : ['\x1B[3m',  '\x1B[23m'],
    'underline'     : ['\x1B[4m',  '\x1B[24m'],
    'inverse'       : ['\x1B[7m',  '\x1B[27m'],
    'strikethrough' : ['\x1B[9m',  '\x1B[29m'],
    'white'         : ['\x1B[37m', '\x1B[39m'],
    'grey'          : ['\x1B[90m', '\x1B[39m'],
    'black'         : ['\x1B[30m', '\x1B[39m'],
    'blue'          : ['\x1B[34m', '\x1B[39m'],
    'cyan'          : ['\x1B[36m', '\x1B[39m'],
    'green'         : ['\x1B[32m', '\x1B[39m'],
    'magenta'       : ['\x1B[35m', '\x1B[39m'],
    'red'           : ['\x1B[31m', '\x1B[39m'],
    'yellow'        : ['\x1B[33m', '\x1B[39m'],
    'whiteBG'       : ['\x1B[47m', '\x1B[49m'],
    'greyBG'        : ['\x1B[49;5;8m', '\x1B[49m'],
    'blackBG'       : ['\x1B[40m', '\x1B[49m'],
    'blueBG'        : ['\x1B[44m', '\x1B[49m'],
    'cyanBG'        : ['\x1B[46m', '\x1B[49m'],
    'greenBG'       : ['\x1B[42m', '\x1B[49m'],
    'magentaBG'     : ['\x1B[45m', '\x1B[49m'],
    'redBG'         : ['\x1B[41m', '\x1B[49m'],
    'yellowBG'      : ['\x1B[43m', '\x1B[49m']
}

function log (key, obj) {
    if (typeof obj === 'string') {
        console.log(styles[key][0] + '%s' + styles[key][1], obj)
    } else if (typeof obj === 'object') {
        console.log(styles[key][0] + '%o' + styles[key][1], obj)
    } else {
        console.log(styles[key][0] + '%s' + styles[key][1], obj)
    }
}

module.exports = log

调用：

log('cyan', 'Hello World!')