Question

我有两个不同的节点脚本...... save_info.js从openConections array导入sse_server.js。并且sse_server.js从function broadcast导入save_info.js。但是，这导致openConnections array在undefined内save_info.js。为什么会这样，我该如何解决这个问题？

save_info.js：

var openConnections = require('../scripts/sse_server.js').openConnections;

function broadcast(result, event, httpObject) { 
    var result = JSON.stringify(result);
    var date = new Date().getMilliseconds();
    httpObject.write('id: ' + date + '\n');
    httpObject.write('data: { \"' + event + '\":\n');
    httpObject.write('data:' + result + '\n');
    httpObject.write('data: }' + '\n\n');
}

 function db_finish(err, product, numberAffected, 
                   result, event) {
    if (err) { console.log(err) }
    else { 
        console.log("Db insert successfull");
        openConnections.forEach(function(httpObject) {
            broadcast(result, event, httpObject);
        });
    }
    console.log("Numer effected " + numberAffected);
}
module.exports.openConnections = openConnections;

sse_server.js：

var broadcast = require("../data/save_info").broadcast; 

var openConnections = []; 

    for (var model in models){
        models[model].find({}).sort({_id: -1}).limit(1).exec(
            function (err, result){
                broadcast(result, model, res);
            });
    }
 module.exports.broadcast = broadcast;

Answer 1

为了防止循环依赖，nodejs模块加载器停止在save_info.js中加载sse_server模块这就是未定义openConnections的原因。要解决此问题，请执行以下操作：

1）将broadcast（）移出到一个单独的模块（例如broadcast.js）。

2）在sse_server.js和save_info.js中放置require（＆＃39; ../ data / broadcast.js＆＃39;）

3）删除sse_server.js中的require（＆＃39; ../ data / save_info＆＃39;）

节点require（）问题与2个相互需要的脚本

1 个答案: