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                            ### 文件是否存在
~~~
const fs = require('fs')
fs.stat("test.txt", function (err, result) {
    if(err) throw err;
    console.log(result);
})
~~~
```
Stats {
  dev: 2220350796,
  mode: 33206,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: undefined,
  ino: 281474976994217,
  size: 21,
  blocks: undefined,
  atimeMs: 1556963438258.4846,
  mtimeMs: 1557035090002.235,
  ctimeMs: 1557035090002.235,
  birthtimeMs: 1556963431909.1213,
  atime: 2019-05-04T09:50:38.258Z,
  mtime: 2019-05-05T05:44:50.002Z,
  ctime: 2019-05-05T05:44:50.002Z,
  birthtime: 2019-05-04T09:50:31.909Z }
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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