Express.js中的路由 - 动态参数数量

Question

我有一个概念,用于创建具有多个参数的路由,当它的数量是动态的时,例如:

/v2/ModuleName/Method/Method2/

在Express中我想把它解析为:Modules.v2.ModuleName.Method.Method2().何时只是一种方法,这当然应该是Modules.v2.ModuleName.Method().有可能这样做吗？

Answer 1

您可以拆分路径名,然后从Modules对象中查找方法,如下所示:

// fields = ['v2', 'ModuleName', 'Method', 'Method2']

var method = Modules;
fields.forEach(function (field) {
    method = method[field];
})

// call method
console.log(method());

完整代码:

var express = require('express'), url = require('url');
var app = express();

Modules = {
    method: function () { return 'I am root'},
    v2: {
        method: function () { return 'I am v2';}
    }
};

app.get('/callmethod/*', function (req, res) {
    var path = url.parse(req.url).pathname;

    // split and remove empty element;
    path = path.split('/').filter(function (e) {
        return e.length > 0;
    });

    // remove the first component 'callmethod'
    path = path.slice(1);

    // lookup method in Modules:
    var method = Modules;
    path.forEach(function (field) {
        method = method[field];
    })

    console.log(method());
    res.send(method());

});

app.listen(3000);

在浏览器上测试:

http://example.com:3000/callmethod/method

"我是根"

http://example.com:3000/callmethod/v2/method

"我是v2"

PS:你可以通过url改进这个应用程序来支持将params传递给方法:http://example.com:3000 / callmethod/v2/method？param1 = hello& param2 = word