封装公共函数

exports.$ = (id) => {

    return document.getElementById(id)

}

exports.convertDuration = (time) => {

    // 计算分钟 02  020

    const minutes = "0" + Math.floor(time/60)

    // 计算秒数 02  020

    const seconds = "0" + Math.floor(time - minutes * 60 )

    return minutes.substr(-2) + ':' + seconds.substr(-2)

}

 

 

const { $ } = require('./helper')

const musicList = $('musicList')