微信小程序显示当前系统年月日时分秒

const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()
  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}
const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}
module.exports = {
  formatTime: formatTime
}

<view>{{time}}</view>

var util = require('../../utils/util.js');
Page({
  data: {
  },
  onLoad: function () {
    // 调用函数时，传入new Date()参数，返回值是日期和时间
    var time = util.formatTime(new Date());
    // 再通过setData更改Page()里面的data，动态更新页面的数据
    this.setData({
      time: time
    });
  }
})