NodeJs如何将变量传递给导出函数

Question

我有NodeJs restful api由教程制作。 在我的端点我想传递导出功能。 例如：

// main.js
REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", function(req, res) {
        var query = ... 
        connection.query(query,function(err, row) {...}
    });
}

但我想这样做：

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create);
}

// example.js
exports.create = function(req, res) {
    var query = ... 
    connection.query(query,function(err, row) {...}
}

但是，我的connection在example.js中不可用。 我怎么能通过呢？

Answer 1

这样的事情可能会有所帮助：

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create(connection));
}

// example.js
exports.create = function(connection) {
    return function(req, res) {
       var query = ... 
       connection.query(query,function(err, row) {...}
    }
}

Answer 2

绑定示例以创建example.create.bind(example,connections)

// main.js
var example = require('./example.js');

REST_ROUTER.prototype.handleRoutes = function(router, connection, md5) {
    router.get("/create", example.create.bind(example,connections));
}

// example.js
exports.create = function(connection, req, res) {
    var query = ... 
    connection.query(query,function(err, row) {...}
}