JavaScript手写原生任务定时器实现详解

function a1(value = "") {
            console.log("定时任务被调用了 携带的参数==>>", value)
        }

        function a2() {
            console.log("定时任务被调用了 我是无参数")
        }

let daily_time = {
            func: a1,
            parm: "我是每秒",
            year: "*",
            month: "*",
            date: "*",
            hours: "*",
            minutes: "*",
            seconds: "*"
        }
        let monthly_transaction = {
            func: a2,
            parm: null,
            year: "*",
            month: "*",
            date: "*",
            hours: "*",
            minutes: "1",
            seconds: "*"
        }
        
        let monthly_summary = {
            func: a1,
            parm: "我是每小时 1分 1秒",
            year: "*",
            month: "*",
            date: "*",
            hours: "*",
            minutes: "1",
            seconds: "1"
        }
        addTimer(daily_time)
        addTimer(monthly_transaction)
        addTimer(monthly_summary)
        startTimer()

// 缓存定时任务
// {
//     func 方法名
//  parm 方法参数

//     year 年
//     month 月
//  date 日
//     hours 时
//     minutes 分
//     seconds 秒
// }
//  * 表示每刻都执行  数字 表示定时这个时间执行

/**
* 每年 1月1日1时1分1秒
* year *
* month 1
* date 1
* hours 1
* minutes 1
* seconds 1
*/

/**
* 每年每月每日每时1分每秒
* year *
* month *
* date *
* hours *
* minutes 1
* seconds *
*/

/**
* 每秒
* year *
* month *
* date *
* hours *
* minutes *
* seconds *
*/

var timer_list = []
var is_timer = null


// 启动
function startTimer() {
    console.log("启动定时任务")
    if (!is_timer) {
        timeoutFunc()
    }
}

// 停止
function stopTimer() {
    console.log("停止定时任务")
    if (is_timer) {
        clearInterval(is_timer);
        is_timer = null
    }
}

// 清除定时任务
function cleanTimer() {
    stopTimer()
    timer_list = []
}


// 添加定时任务
function addTimer(item = {}) {
    let n = {
        "func": item.func || null,
        "parm": item.parm || null,
        "year": item.year || "*",
        "month": item.month || "*",
        "date": item.date || "*",
        "hours": item.hours || "*",
        "minutes": item.minutes || "*",
        "seconds": item.seconds || "*"
    }
    timer_list.push(n)
}


function timeoutFunc() {
    if (is_timer) {
        return
    }
    is_timer = setInterval(function() {
        let da = new Date()
        let fullYear = (da.getFullYear()).toString()
        let month = (da.getMonth()).toString()
        let dat = (da.getDate()).toString()
        let hours = (da.getHours()).toString()
        let minutes = (da.getMinutes()).toString()
        let seconds = (da.getSeconds()).toString()

        // console.log("定时......",timer_list)
        // console.log("年：", fullYear)
        // console.log("月：", month)
        // console.log("日：", dat)
        // console.log("时：", hours)
        // console.log("分：", minutes)
        // console.log("秒：", seconds)

        for (let i in timer_list) {
            let item = timer_list[i]

            if (item.year != "*" && item.year != fullYear) {
                continue
            }
            if (item.month != "*" && item.month != month) {
                continue
            }
            if (item.date != "*" && item.date != dat) {
                continue
            }
            if (item.hours != "*" && item.hours != hours) {
                continue
            }
            if (item.minutes != "*" && item.minutes != minutes) {
                continue
            }
            if (item.seconds != "*" && item.seconds != seconds) {
                continue
            }
            console.log("调用定时任务", item)
            if (item.func && item.parm) {
                item.func(item.parm)
            } else {
                item.func()
            }
        }
    }, 1000)
}