用nodejs来读文件 node file.js 文件名

file.js

var fs = require('fs');

var path = process.argv.slice(2).pop();
var start = new Date();
var readStream = fs.createReadStream(path);
readStream
.on('data', function (chunk) {
})
.on('end', function () {
  var end = new Date();
  console.log((end - start)/1000 + "second ")
  console.log(path + " load is done");
})