day-week/date/src/days.js

``` 功能 ```：某年某月天数

import {judgeLeap, yearDay} from '../public/common'

/**
 * 某年某月天数
 * @param {String} data 格式：年-月-日
 * @return {Number} 某月天数
 */
let monthDays = function(data){
    let index = data.indexOf('-')
    let year = parseInt(data)
    let month = parseInt(data.substr(index + 1, data.length -1))
    let res = judgeLeap(year, month)
    console.log(res)
    return res.month
}

/**
 * 某两天间隔天数
 * @param {String} day1 格式：年-月-日 
 * @param {String} day2 格式：年-月-日 
 * @return {Number} 某天与某天相隔天数
 */
let separateDays = function(day1, day2){
    let year = parseInt(day1)
    let index1 = day1.indexOf('-')
    let index2 = day1.lastIndexOf('-')
    let month = parseInt(day1.substr(index1 + 1, index2 - 1))
    let day = parseInt(day1.substr(index2 + 1, day1.length - 1))
    day1 = {
        year: year,
        month: month,
        day: day
    }

    year = parseInt(day2)
    index1 = day2.indexOf('-')
    index2 = day2.lastIndexOf('-')
    month = parseInt(day2.substr(index1 + 1, index2 - 1))
    day = parseInt(day2.substr(index2 + 1, day2.length - 1))
    day2 = {
        year: year,
        month: month,
        day: day
    }

    let days = 0
    if(day1.year !== day2.year){
        for(let i = day1.year + 1; i < day2.year; i++){
            let yearDay = judgeLeap(i)
            days += yearDay.year
        }
        for(let i = day1.month; i <= 12; i++){
            let monthDay = judgeLeap(i)
            days += monthDay.month
        }
        for(let i = 1; i < day2.month; i++){
            let monthDay = judgeLeap(i)
            days += monthDay.month
        }
    }else{
        for(let i = day1.month + 1; i < day2.month; i++){
            let monthDay = judgeLeap(i)
            days += monthDay.month
        }
    }
    days += day1.day
    days += day2.day
    console.log(days)
    return days
}

/**
 * 获取某天是今年第几天
 * @param {String} data 格式为：年-月-日
 * @returns {Number} 此年第几天
 */
let yearToDay = function(data){
    let year = parseInt(data)
    let index1 = data.indexOf('-')
    let index2 = data.lastIndexOf('-')
    let month = parseInt(data.substr(index1 + 1, index2 - 1))
    let day = parseInt(data.substr(index2 + 1, data.length - 1))
    let res = yearDay(year, month, day)
    return res
}

module.exports = {
    yearToDay: yearToDay,
    separateDays: separateDays,
    monthDays: monthDays
}