js常用的小工具方法

function formatTime(date){
    var year = date.getFullYear()
    var month = date.getMonth() + 1
    var day = date.getDate()
    var hour = date.getHours()
    var minute = date.getMinutes()
    var second = date.getSeconds()

    function formatNumber(n){
          n = n.toString()
          return n[1]  ? n : '0' + n
    }

    return [year, month, day].map(formatNumber).join('/') +' '+  [hour, minute, second].map(formatNumber).join(':')
}   
function for