javascript - 如何订阅事件流 - 服务器端

Question

我有一个返回 text/event-stream 数据的网址，因此我尝试连接并打印我找到的所有内容:

var url = "..."
var source = new EventSource(url);

source.addEventListener('message', function(e) { 
    console.log(e.data);
}, false);

source.addEventListener('open', function(e) { }, false);

source.addEventListener('error', function(e) {
    if (e.readyState == EventSource.CLOSED) {  }
}, false);

不幸的是，这在服务器端不起作用。我可以这样连接吗？

$ node app.js

app.js:2
var source = new EventSource(url);
                 ^

ReferenceError: EventSource is not defined
    at Object.<anonymous> (app.js:2:18)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)
    at node.js:968:3

Answer 1

看来你忘记了服务器端:

var EventSource = require("eventsource");