Question

以下是我的代码

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。有人请解释一下。感谢。

Answer 1

恭喜您刚刚发现了JS attribute的论据function object，请参考MDN Docs了解更多信息

arguments 对象是一个类似于Array的对象，对应于传递给函数的参数。

尝试console.log(arguments)或

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

Answer 2

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"hh:mm a"];// change here as per your need
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
NSString *stringFromDate = [formatter stringFromDate: globalDateTime];

Learnyounode教程＃11 HTTP文件服务器

2 个答案: