node.js - 从回调访问调用者参数

Question

我有这个:

var parseFile = function(err, data) {
 // I need to access 'myFile'
};
fs.readFile(myFile, 'utf8', parseFile);

如何在别处声明的回调中访问 'myFile'？

Answer 1

function parseFile(myFile) {
  return function (err, data) {
    // its a closure bound variable! yay.
  }
}

fs.readFile(myFile, "utf8", parseFile(myFile))