Node.js 响应回调中的节点https请求选项

我正在对设置了https的节点发出https请求。列表中的每个本地IP都映射到不同的公共IP

我只是简单地尝试打印由internet上的服务器报告的公共IP和相应的本地IP。问题是我不确定如何在响应回调中获取请求选项：

var https = require('https');

var localIps = [
    '192.168.88.135',
    '192.168.88.136',
    '192.168.88.137',
    '192.168.88.138',
    '192.168.88.139',
];

for(index in localIps) {
    var localIp = localIps[index];

    var options = {
        localAddress: localIp,
        host: 'mypublicserver.com',
        path: '/whats-my-ip.php'
    };

    https.get(options, function(res) {
        res.on('data', function(d) {
            console.log(
                // XXX localIp is always printing the last IP from localIps
                'Local Network IP: ' + localIp +
                ' Public Outbound IP: ' + d);
        });

    }).on('error', function(e) {
        console.error(e);
    });
}

它在打印这样的东西，这是错误的

Local Network IP: 192.168.88.139 Public Outbound IP: 88.88.888.132
Local Network IP: 192.168.88.139 Public Outbound IP: 88.88.888.131
Local Network IP: 192.168.88.139 Public Outbound IP: 88.88.888.130
Local Network IP: 192.168.88.139 Public Outbound IP: 88.88.888.133
Local Network IP: 192.168.88.139 Public Outbound IP: 88.88.888.134

那么，如何在响应回调中获得正确的options对象呢

---

显然res是一个，但我无法找到如何从中获取关联的请求对象。

问题是for循环将在任何响应返回之前完成对localIps的迭代。因此，当第一个响应返回时，localIp变量被设置为localIps数组的最后一个ip

最简单的方法是将代码封装在闭包中，或者也称为IIFE->立即调用函数表达式

var https = require('https');

var localIps = [
    '192.168.88.135',
    '192.168.88.136',
    '192.168.88.137',
    '192.168.88.138',
    '192.168.88.139',
];

for(index in localIps) {
    var localIp = localIps[index];

    var options = {
        localAddress: localIp,
        host: 'mypublicserver.com',
        path: '/whats-my-ip.php'
    };

    (function(opts){

        https.get(opts, function(res) {
            res.on('data', function(d) {
                console.log(
                    // XXX localIp is always printing the last IP from localIps
                    'Local Network IP: ' + opts.localAddress +
                    ' Public Outbound IP: ' + d);
            });

        }).on('error', function(e) {
            console.error(e);
        });

    })(options);
}

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