javascript - Learnyounode教程#11 HTTP文件服务器

Question

下面是我的代码

var http = require('http');
var fs = require('fs');
var arguments = process.argv;
var path = process.argv[3];
var path2 = arguments[3];

var server = http.createServer(
    function (req, res)
    {

    console.log('path1'+path);
    console.log('path2'+path2);
    console.log('path3'+arguments[3]);
        var fileStream = fs.createReadStream(arguments[3]);
        fileStream.pipe(res);
    }
);

server.listen(arguments[2]);

如果我将路径或路径 2 传递给 fs.createReadStream()，我的代码可以工作，但如果我传递参数 [3]，它会失败，console.log(path3) 也会打印 undefined。我不明白这一点。有人请解释。谢谢。

Answer 1

恭喜你发现了JS的函数对象的参数属性请引用MDN Docs了解更多

The arguments object is an Array-like object corresponding to the arguments passed to a function.

试试 console.log(arguments) 或者

var http = require('http');
var fs = require('fs');
var parguments = process.argv;
var path = process.argv[3];
var path2 = parguments[3];

var server = http.createServer(
    function (req, res)
    {

    console.log('path1'+path);
    console.log('path2'+path2);
    console.log('path3'+parguments[3]);
        var fileStream = fs.createReadStream(parguments[3]);
        fileStream.pipe(res);
    }
);

server.listen(parguments[2]);

请注意，我已将 arguments 的名称更改为 parguments