js时间戳转时间格式

可以使用JavaScript内置的`Date()`对象来将时间戳转换为可读的时间格式。具体步骤如下：

1. 创建一个`Date`对象，将时间戳作为参数传入：

   let timestamp = 1624342436000;
   let date = new Date(timestamp);

2. 使用`getFullYear()`、`getMonth()`、`getDate()`、`getHours()`、`getMinutes()`、`getSeconds()`方法分别获取年、月、日、小时、分钟、秒：

   let year = date.getFullYear();
   let month = date.getMonth() + 1;
   let day = date.getDate();
   let hour = date.getHours();
   let minute = date.getMinutes();
   let second = date.getSeconds();

3. 将获取到的年月日时分秒拼接成需要的时间格式：

   let time = `${year}-${month}-${day} ${hour}:${minute}:${second}`;

完整代码示例：

let timestamp = 1624342436000;
let date = new Date(timestamp);
let year = date.getFullYear();
let month = date.getMonth() + 1;
let day = date.getDate();
let hour = date.getHours();
let minute = date.getMinutes();
let second = date.getSeconds();
let time = `${year}-${month}-${day} ${hour}:${minute}:${second}`;
console.log(time);

输出结果：`2021-6-22 15:33:56`