JS通用公共函数

function formatTime(time) {
if (typeof time !== 'number' || time < 0) {
return time
}

var hour = parseInt(time / 3600)
time = time % 3600
var minute = parseInt(time / 60)
time = time % 60
var second = time

return ([hour, minute, second]).map(function(n) {
n = n.toString()
return n[1] ? n : '0' + n
}).join(':')
}

// 时间戳转日期
function timestampToDate(timestamp) {
var date = new Date(timestamp * 1000); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
var Y = date.getFullYear() + '-';
var M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';
var D = date.getDate() + ' ';
var h = date.getHours() + ':';
var m = date.getMinutes() + ':';
var s = date.getSeconds();
return Y + M + D + h + m + s;
}
// 坐标转换
function formatLocation(longitude, latitude) {
if (typeof longitude === 'string' && typeof latitude === 'string') {
longitude = parseFloat(longitude)
latitude = parseFloat(latitude)
}

longitude = longitude.toFixed(2)
latitude = latitude.toFixed(2)

return {
longitude: longitude.toString().split('.'),
latitude: latitude.toString().split('.')
}
}

//时分秒转换剩余
var dateUtils = {
UNITS: {
'年': 31557600000,
'月': 2629800000,
'天': 86400000,
'小时': 3600000,
'分钟': 60000,
'秒': 1000
},
humanize: function(milliseconds) {
var humanize = '';
for (var key in this.UNITS) {
if (milliseconds >= this.UNITS[key]) {
humanize = Math.floor(milliseconds / this.UNITS[key]) + key + '前';
break;
}
}
return humanize || '刚刚';
},
format: function(dateStr) {
var date = this.parse(dateStr)
var diff = Date.now() - date.getTime();
if (diff < this.UNITS['天']) {
return this.humanize(diff);
}
var _format = function(number) {
return (number < 10 ? ('0' + number) : number);
};
return date.getFullYear() + '-' + _format(date.getMonth() + 1) + '-' + _format(date.getDay()) + ' ' +
_format(date.getHours()) + ':' + _format(date.getMinutes());
},
parse: function(str) { //将"yyyy-mm-dd HH:MM:ss"格式的字符串，转化为一个Date对象
var a = str.split(/[^0-9]/);
return new Date(a[0], a[1] - 1, a[2], a[3], a[4], a[5]);
}
};

//判断是否空数组，空对象
function isEmpty(obj) {
if (!obj && obj !== 0 && obj !== '') {
return true;
}
if (Array.prototype.isPrototypeOf(obj) && obj.length === 0) {
return true;
}
if (Object.prototype.isPrototypeOf(obj) && Object.keys(obj).length === 0) {
return true;
}
return false;
}

module.exports = {
formatTime: formatTime,
timestampToDate: timestampToDate,
formatLocation: formatLocation,
dateUtils: dateUtils,
isEmpty:isEmpty
}