解決 subject.onNext is not a function

今天在編程的時候遇到下面的問題：

執行：

var subject = new Rx.BehaviorSubject(42);


var subscription = subject.subscribe(
    function (x) {
        console.log('Next: ' + x.toString());
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });


// => Next: 42


subject.onNext(56);
// => Next: 56

報錯：

• "Next: 42"
• "error"
• "TypeError: subject.onNext is not a function
      at letepecazo.js:54:9"

解決辦法：

Due to changes to accommodate the ES7 Observable spec, the API has changed for observables:

• onNext -> next
• onError -> error
• onCompleted -> complete