打印随机颜色

 rndColor = function () {
            let colorStr = '0123456789ABCDEF';
            let color = ['#'];
            for (let i = 0; i < 6; i++) {
                color.push(colorStr[Math.floor(Math.random() * colorStr.length)])
            }
            return color.join('')
        }
        console.log(rndColor());