[英]Subscribing to RxJs Observable with only onNext handler gives “this._subscribe is not a function”
[英]“TypeError: this._subscribe is not a function” When trying RxJS in simple Node Module
我有以下節點代碼
//index.js
var username = process.argv[2],
password = process.argv[3],
factories = require('./factories')(username, password);
factories.subscribe(function(data){
console.log(data.length);
});
factories.refresh();
//factories.js
var Rx = require('rx');
var factories = function(username, password){
var factories = [];
var source = Rx.Observable.from(factories);
var baseUrl = "<url>",
factoriesOpt = {
'uri': baseUrl+"<path>",
'method': 'GET',
'auth': {
'user': username,
'pass': password
}
},
response="",
request = require('request');
var refresh = function(){
request(factoriesOpt)
.on('data', function(chunk){
if(chunk)
response += chunk;
})
.on('end', function(){
factories = JSON.parse(response);
})
}
return {
subscribe : source.subscribe,
factories : factories,
refresh : refresh
};
};
module.exports = factories;
但是當我運行這個時我得到了錯誤...
TypeError: this._subscribe is not a function
at Object.Rx.Observable.observableProto.subscribe.observableProto.forEach [as subscribe] (/Users/<code location>/node_modules/rx/dist/rx.js:2034:19)
at Object.<anonymous> (/Users/<code location>/index.js:5:11)
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
更新資料
如果我改變工廠使用...
var subscribe = function(callback){
source.subscribe(callback);
};
...
return {
subscribe : subscribe,
factories : factories,
refresh : refresh
};
它有效,但我想避免包裝。
這是一個具有約束力的問題,也是javascript的優點之一。 現在不再贅述,但基本上應該代替source.subscribe
來執行source.subscribe.bind(source)
。 如果可行,請告訴我,我將在綁定問題上提供更多詳細信息。
剛剛找到描述綁定錯誤的參考: http : //developer.telerik.com/featured/seven-javascript-quirks-i-wish-id-known-about/#functions 。 看看#3。
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