JavaScript自动生成24小时时间区间

1、时间跨度为60分钟

（1）时间区间为字符串

有时候可能需要用到24小时的时间区间，跨度为60分钟，比如下面这样的：

['00:00 - 01:00', '01:00 - 02:00', '02:00 - 03:00', '03:00 - 04:00', '04:00 - 05:00', '05:00 - 06:00', '06:00 - 07:00', '07:00 - 08:00', '08:00 - 09:00', '09:00 - 10:00', '10:00 - 11:00', '11:00 - 12:00', '12:00 - 13:00', '13:00 - 14:00', '14:00 - 15:00', '15:00 - 16:00', '16:00 - 17:00', '17:00 - 18:00', '18:00 - 19:00', '19:00 - 20:00', '20:00 - 21:00', '21:00 - 22:00', '22:00 - 23:00', '23:00 - 24:00']

如果手动去写，则有点麻烦，这个时候可以使用一个简单的 JS 函数去自动生成，示例代码如下：

function generateTimes() {
    let timeArrays = new Array(24).fill("");

    timeArrays.forEach((item, index) => timeArrays[index] = (index < 10 ? '0'   index : index)   ':00'   ' - '   ((index   1) < 10 ? '0'   (index   1) : (index   1))   ':00');

    return timeArrays;
}

当然，上面的方法，也可以简写成下面这样的，只需要一行代码即可

let timeArrays = new Array(24).fill('').map((item, index) => (index < 10 ? '0'   index : index)   ':00'   ' - '   ((index   1) < 10 ? '0'   (index   1) : (index   1))   ':00');

（2）时间区间为数组

let timeArrays = new Array(24).fill(['', '']).map((item, index) => [(index < 10 ? '0'   index : index)   ':00', ((index   1) < 10 ? '0'   (index   1) : (index   1))   ':00']);
console.log(JSON.stringify(timeArrays));

生成的时间区间如下：

[["00:00","01:00"],["01:00","02:00"],["02:00","03:00"],["03:00","04:00"],["04:00","05:00"],["05:00","06:00"],["06:00","07:00"],["07:00","08:00"],["08:00","09:00"],["09:00","10:00"],["10:00","11:00"],["11:00","12:00"],["12:00","13:00"],["13:00","14:00"],["14:00","15:00"],["15:00","16:00"],["16:00","17:00"],["17:00","18:00"],["18:00","19:00"],["19:00","20:00"],["20:00","21:00"],["21:00","22:00"],["22:00","23:00"],["23:00","24:00"]]

（3）时间区间为对象

let timeArrays = new Array(24).fill({}).map((item, index) => {
    return {
        start: (index < 10 ? '0'   index : index)   ':00',
        end: ((index   1) < 10 ? '0'   (index   1) : (index   1))   ':00'
    }
});
console.log(JSON.stringify(timeArrays));

生成的时间区间如下：

[{"start":"00:00","end":"01:00"},{"start":"01:00","end":"02:00"},{"start":"02:00","end":"03:00"},{"start":"03:00","end":"04:00"},{"start":"04:00","end":"05:00"},{"start":"05:00","end":"06:00"},{"start":"06:00","end":"07:00"},{"start":"07:00","end":"08:00"},{"start":"08:00","end":"09:00"},{"start":"09:00","end":"10:00"},{"start":"10:00","end":"11:00"},{"start":"11:00","end":"12:00"},{"start":"12:00","end":"13:00"},{"start":"13:00","end":"14:00"},{"start":"14:00","end":"15:00"},{"start":"15:00","end":"16:00"},{"start":"16:00","end":"17:00"},{"start":"17:00","end":"18:00"},{"start":"18:00","end":"19:00"},{"start":"19:00","end":"20:00"},{"start":"20:00","end":"21:00"},{"start":"21:00","end":"22:00"},{"start":"22:00","end":"23:00"},{"start":"23:00","end":"24:00"}]

2、时间跨度为30分钟

如果时间跨度为30分钟，也就是说1天24小时，需要分成48个时间区间。

（1）时间区间为字符串

let timeArrays = new Array(48).fill('').map((item, index) => {
    let startVal = index * 30;
    let endVal = (index   1) * 30;
    let startHour = Math.floor((startVal / 60));
    let startMinute = (startVal % 60);
    let endHour = Math.floor((endVal / 60));
    let endMinute = (endVal % 60);
    let startTime = ((startHour < 10) ? ('0'   startHour) : startHour)   ':'   (startMinute === 0 ? '00' : startMinute);
    let endTime = ((endHour < 10) ? ('0'   endHour) : endHour)   ':'   (endMinute === 0 ? '00' : endMinute);
    
    return startTime   ' - '   endTime;
});
console.log(timeArrays);

生成的时间区间如下：

['00:00 - 00:30', '00:30 - 01:00', '01:00 - 01:30', '01:30 - 02:00', '02:00 - 02:30', '02:30 - 03:00', '03:00 - 03:30', '03:30 - 04:00', '04:00 - 04:30', '04:30 - 05:00', '05:00 - 05:30', '05:30 - 06:00', '06:00 - 06:30', '06:30 - 07:00', '07:00 - 07:30', '07:30 - 08:00', '08:00 - 08:30', '08:30 - 09:00', '09:00 - 09:30', '09:30 - 10:00', '10:00 - 10:30', '10:30 - 11:00', '11:00 - 11:30', '11:30 - 12:00', '12:00 - 12:30', '12:30 - 13:00', '13:00 - 13:30', '13:30 - 14:00', '14:00 - 14:30', '14:30 - 15:00', '15:00 - 15:30', '15:30 - 16:00', '16:00 - 16:30', '16:30 - 17:00', '17:00 - 17:30', '17:30 - 18:00', '18:00 - 18:30', '18:30 - 19:00', '19:00 - 19:30', '19:30 - 20:00', '20:00 - 20:30', '20:30 - 21:00', '21:00 - 21:30', '21:30 - 22:00', '22:00 - 22:30', '22:30 - 23:00', '23:00 - 23:30', '23:30 - 24:00']

（2）时间区间为数组

let timeArrays = new Array(48).fill(['', '']).map((item, index) => {
    let startVal = index * 30;
    let endVal = (index   1) * 30;
    let startHour = Math.floor((startVal / 60));
    let startMinute = (startVal % 60);
    let endHour = Math.floor((endVal / 60));
    let endMinute = (endVal % 60);
    let startTime = ((startHour < 10) ? ('0'   startHour) : startHour)   ':'   (startMinute === 0 ? '00' : startMinute);
    let endTime = ((endHour < 10) ? ('0'   endHour) : endHour)   ':'   (endMinute === 0 ? '00' : endMinute);
    
    return [startTime, endTime];
});
console.log(JSON.stringify(timeArrays));

生成的时间区间如下：

[["00:00","00:30"],["00:30","01:00"],["01:00","01:30"],["01:30","02:00"],["02:00","02:30"],["02:30","03:00"],["03:00","03:30"],["03:30","04:00"],["04:00","04:30"],["04:30","05:00"],["05:00","05:30"],["05:30","06:00"],["06:00","06:30"],["06:30","07:00"],["07:00","07:30"],["07:30","08:00"],["08:00","08:30"],["08:30","09:00"],["09:00","09:30"],["09:30","10:00"],["10:00","10:30"],["10:30","11:00"],["11:00","11:30"],["11:30","12:00"],["12:00","12:30"],["12:30","13:00"],["13:00","13:30"],["13:30","14:00"],["14:00","14:30"],["14:30","15:00"],["15:00","15:30"],["15:30","16:00"],["16:00","16:30"],["16:30","17:00"],["17:00","17:30"],["17:30","18:00"],["18:00","18:30"],["18:30","19:00"],["19:00","19:30"],["19:30","20:00"],["20:00","20:30"],["20:30","21:00"],["21:00","21:30"],["21:30","22:00"],["22:00","22:30"],["22:30","23:00"],["23:00","23:30"],["23:30","24:00"]]

（3）时间区间为对象

let timeArrays = new Array(48).fill(['', '']).map((item, index) => {
    let startVal = index * 30;
    let endVal = (index   1) * 30;
    let startHour = Math.floor((startVal / 60));
    let startMinute = (startVal % 60);
    let endHour = Math.floor((endVal / 60));
    let endMinute = (endVal % 60);
    let startTime = ((startHour < 10) ? ('0'   startHour) : startHour)   ':'   (startMinute === 0 ? '00' : startMinute);
    let endTime = ((endHour < 10) ? ('0'   endHour) : endHour)   ':'   (endMinute === 0 ? '00' : endMinute);
    
    return {
        start: startTime,
        end: endTime
    };
});
console.log(JSON.stringify(timeArrays));

生成的时间区间如下：

[{"start":"00:00","end":"00:30"},{"start":"00:30","end":"01:00"},{"start":"01:00","end":"01:30"},{"start":"01:30","end":"02:00"},{"start":"02:00","end":"02:30"},{"start":"02:30","end":"03:00"},{"start":"03:00","end":"03:30"},{"start":"03:30","end":"04:00"},{"start":"04:00","end":"04:30"},{"start":"04:30","end":"05:00"},{"start":"05:00","end":"05:30"},{"start":"05:30","end":"06:00"},{"start":"06:00","end":"06:30"},{"start":"06:30","end":"07:00"},{"start":"07:00","end":"07:30"},{"start":"07:30","end":"08:00"},{"start":"08:00","end":"08:30"},{"start":"08:30","end":"09:00"},{"start":"09:00","end":"09:30"},{"start":"09:30","end":"10:00"},{"start":"10:00","end":"10:30"},{"start":"10:30","end":"11:00"},{"start":"11:00","end":"11:30"},{"start":"11:30","end":"12:00"},{"start":"12:00","end":"12:30"},{"start":"12:30","end":"13:00"},{"start":"13:00","end":"13:30"},{"start":"13:30","end":"14:00"},{"start":"14:00","end":"14:30"},{"start":"14:30","end":"15:00"},{"start":"15:00","end":"15:30"},{"start":"15:30","end":"16:00"},{"start":"16:00","end":"16:30"},{"start":"16:30","end":"17:00"},{"start":"17:00","end":"17:30"},{"start":"17:30","end":"18:00"},{"start":"18:00","end":"18:30"},{"start":"18:30","end":"19:00"},{"start":"19:00","end":"19:30"},{"start":"19:30","end":"20:00"},{"start":"20:00","end":"20:30"},{"start":"20:30","end":"21:00"},{"start":"21:00","end":"21:30"},{"start":"21:30","end":"22:00"},{"start":"22:00","end":"22:30"},{"start":"22:30","end":"23:00"},{"start":"23:00","end":"23:30"},{"start":"23:30","end":"24:00"}]

3、时间跨度任意指定

除了常见的时间跨度为60分钟或者30分钟，有的时候还可能需要其他的时间跨度，那么是否可能写一个相对通用的方法，参数为时间跨度（以分钟为单位），当然是可以的，具体实现代码如下（这里仅生成时间区间为字符串的，其他格式参考上面）：

function generateTimes(step) {
    let size = Math.floor(24 * 60 / step);
    let timeArrays = new Array(size).fill('').map((item, index) => {
        let startVal = index * step;
        let endVal = (index   1) * step;
        let startHour = Math.floor((startVal / 60));
        let startMinute = (startVal % 60);
        let endHour = Math.floor((endVal / 60));
        let endMinute = (endVal % 60);
        let startTime = ((startHour < 10) ? ('0'   startHour) : startHour)   ':'   (startMinute === 0 ? '00' : startMinute);
        let endTime = ((endHour < 10) ? ('0'   endHour) : endHour)   ':'   (endMinute === 0 ? '00' : endMinute);
    
        return startTime   ' - '   endTime;
    });

    return timeArrays;
}

比如想要生成时间跨度为120分钟的时间区间，可以直接传入120即可

console.log(generateTimes(120));

生成的时间区间如下：

['00:00 - 02:00', '02:00 - 04:00', '04:00 - 06:00', '06:00 - 08:00', '08:00 - 10:00', '10:00 - 12:00', '12:00 - 14:00', '14:00 - 16:00', '16:00 - 18:00', '18:00 - 20:00', '20:00 - 22:00', '22:00 - 24:00']

需要注意的是，如果时间跨度无法被整除，那么生成的时间区间可能无法完全覆盖24小时。

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