wangshuaitao

copy_wst_twobag

```javascript let fs = require("fs"); const copyDir = (sorDir,tarDir)=>{ if(!fs.existsSync(sorDir)){ throw new Error("不存在复制路径" + sorDir); } if(fs.existsSync(tarDir)){ throw new Error("已经存在该目标路径啦" + tarDir); } f

demo-day-one

```JavaScript class Moment{ constructor(time){ this.time=time; this.change() } change(){ let nowtime = new Date(); let newtime = new Date(this.time);