itheima-tools-eahow/dateFormat.js

```js npm i itheima-tools-eahow

// 格式化时间的方法
function dateFormat(dateStr) {
    let date = new Date(dateStr);
    let y = date.getFullYear();
    let m = padZero(date.getMonth() + 1);
    let d = padZero(date.getDate());
    let hh = padZero(date.getHours());
    let mm = padZero(date.getMinutes());
    let ss = padZero(date.getSeconds());
    return `${y}-${m}-${d} ${hh}:${mm}:${ss}`;
};
// 补零
function padZero(n) {
    return n < 10 ? '0' + n : n;
};
module.exports = {
    dateFormat
}