根据一个需求，需要做一个功能：
根据传入的一个json(日期，年份，月数，星期)，来生成以此为中心点的前后一周的数据。
该版本的JS 暂时不知处无参数传入，后续待优化。
PS:如图，红圈标记出来就是我们传入的值，上下为生成的对应数据
JS完整代码如下：
// 需要传入的json 格式
var json = {
year: 2017,
month: 12,
weekday: '周六',
day: 1
}
var calendar = {
// 传入任意一个数，生成以该数为中心的，前后三天（共七天的数组）
// 支持年，月，日，星期 四个数据的输出
montharr: [], //月份数组
arr: [], //存储前后七天的数组
calendar_sign: 0,
init: function () {
calendar.arr[3] = json;
calendar.arr.length = 7;
calendar.judgeDay(json); //模拟json 数据，
console.log(calendar.arr)
},
// 判断星期
judgeWeek: function (week) {
var weekday = '';
if (typeof week == 'string') {
switch (week) {
case '周日':
weekday = 0;
break;
case '周一':
weekday = 1;
break;
case '周二':
weekday = 2;
break;
case '周三':
weekday = 3;
break;
case '周四':
weekday = 4;
break;
case '周五':
weekday = 5;
break;
case '周六':
weekday = 6;
break;
default :
break;
}
return Number(weekday);
}
else {
switch (week) {
case 0:
weekday = '周日';
break;
case 1:
weekday = '周一';
break;
case 2:
weekday = '周二';
break;
case 3:
weekday = '周三';
break;
case 4:
weekday = '周四';
break;
case 5:
weekday = '周五';
break;
case 6:
weekday = '周六';
break;
default :
break;
}
return weekday;
}
},
judgeDay: function (json) {
calendar.judgeMonth(json.year);
var add = 0, reduce = 0;
for (var i = 0; i < 7; i++) {
var temJson = {};
var weekNum=calendar.judgeWeek(json.weekday);
if (i == 3) {
calendar.arr[3].sign=0;
} else {
// 判断中心日期 前后日年月星期数据
if (i < 3) {
temJson.day = json.day - (i + 1);
temJson.year = json.year;
if (temJson.day < 1) {
temJson.month = json.month - 1;
if (temJson.month < 1) {
temJson.year = json.year - 1;
temJson.month = 12;
}
temJson.sign = calendar.calendar_sign - 1;
reduce++;
temJson.day = calendar.montharr[temJson.month - 1] - reduce + 1;
} else {
temJson.month = json.month;
temJson.sign = calendar.calendar_sign;
}
var weekday=calendar.judgeWeek(Math.abs(weekNum-(i+1)+7)%7);
temJson.weekday=weekday;
calendar.arr[3 - i - 1] = temJson;
} else if (i > 3) {
temJson.day = json.day + (i - 3);
temJson.year = json.year;
if (temJson.day > calendar.montharr[json.month - 1]) {
temJson.month = json.month + 1;
if (temJson.month > 12) {
temJson.month = 1;
temJson.year = json.year + 1;
}
temJson.sign = calendar.calendar_sign + 1;
add++;
temJson.day = add;
} else {
temJson.month = json.month;
temJson.sign = calendar.calendar_sign
}
var weekday=calendar.judgeWeek((weekNum+(i-3))%7);
temJson.weekday=weekday;
calendar.arr[3 + i - 3] = temJson;
}
}
}
},
//判断每月天数
judgeMonth: function (year) {
if (calendar.judgeYear(year)) {
calendar.montharr = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
} else {
calendar.montharr = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
}
},
//判断闰年
judgeYear: function (year) {
return (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0)
}
}