javascript - 将一个文件包含在另一个文件中

Question

我正在尝试使用 Mocha 进行一些测试驱动开发。仍然在开始涉足软件工程时，我遇到了一个问题，包括 test.js 中的 Graph.js:

项目/Graph/Graph.js:

function Graph(){
    this.nodes = {};
    this.id = 0;
}
Graph.prototype.newId = function(){
    return this.id++;
};
Graph.prototype.addNode = function(data){
    var node = new Node(graph, this.newId());
    node.data = data || {};
    this.nodes[node.id] = node;
    return edge.id;
};
Graph.prototype.removeNode = function(node){
    for(var key in this.nodes){
        for(var key2 in this.nodes[key].to){
            if(this.nodes[key].edges.to[key2] == this){
                delete this.nodes[key].edges.to[key2];
            }
        }
        for(var key2 in this.nodes[key].from){
            if(this.nodes[key].edges.from[key2] == this){
                delete this.nodes[key].edges.from[key2];
            }
        }
    }
    delete this.nodes[node.id];
    return 0;
};
Graph.prototype.addEdge = function(source, target){
    id = this.newId();
    source.edges.to[id] = target;
    target.edges.from[id] = source;
    return id;
};
Graph.prototype.removeEdge = function(edgeId){
    delete this.edges[edgeId];
};

function Node(graph, id){
    this.id = id;
    this.graph = graph;
    this.edges = {};
    this.edges.from = {};
    this.edges.to = {};
};

exports.Graph = Graph;
exports.Node = Node;

项目/测试/test.js:

require('../Graph/Graph.js');

suite('Graph.js', function(){
        setup(function(){
                var graph = new Graph();

                var n0 = graph.addNode({text: "Hello"}),
                    n1 = graph.addNode({text: "Sweet"}),
                    n2 = graph.addNode({text: "Worlds!"});
                var e0 = graph.addEdge(n0, n1),
                    e1 = graph.addEdge(n1, n2);

            });

        test('traverse graph', function(){
                var currentNode = n0;
                var str = ''
                while(Object.keys(currentNode.edges.to).length > 0){
                    str += currentNode.data.text + ' ';
                    currentNode = currentNode.edges.to[Object.keys(currentNode.edges.to)[0]];
                }
                assert.equals(str, 'Hello Sweet Worlds! ');
            });
    });

使用命令

localhost:testing lowerkey$ mocha -u tdd -R nyan

我得到以下结果:

 0   -__,------,
 1   -__|  /\_/\ 
 0   -_~|_( o .o) 
     -_ ""  "" 

  ✖ 1 of 1 test failed:

  1) Graph.js "before each" hook:
     ReferenceError: Graph is not defined
      at Context.<anonymous> (/Users/lowerkey/Desktop/TryThree/testing/test.js:5:19)
      at Hook.Runnable.run (/usr/local/lib/node_modules/mocha/lib/runnable.js:200:32)
      at next (/usr/local/lib/node_modules/mocha/lib/runner.js:201:10)
      at Runner.hook (/usr/local/lib/node_modules/mocha/lib/runner.js:212:5)
      at process.startup.processNextTick.process._tickCallback (node.js:244:9)

更新 使用 var graphjs = require(...); 和 var graph = new graphjs.Graph(); 我得到了图表(小写)未定义。

Answer 1

您必须从exports获取Graph变量

var Graph = require('../Graph/Graph.js').Graph;
...
var graph = new Graph();