當函數在Javascript中將布爾值設置為true時，布爾值將返回false

Question

我遇到了這個問題，准備好在文檔中創建一個Audio Player，並創建一個var來播放為false，但每次似乎都正確調用了函數，但未將該變量設置為true：此代碼是從Click偵聽器調用的函數。

var cartSongPlayer = new Audio();
var playingStatus = false;
var playingTrack;

function switchTrack(trackID, trackSource) {
    //logging basic information:
    console.log('Current Track ID ' + trackID)
    console.log('Current Track Source ' + trackSource)

    console.log('Previous Track ID ' + playingTrack)
    console.log('Playing Status ' + playingStatus)

    if (playingStatus) {
        console.log('song is playing')
        if (trackID == playingTrack) {
            playingStatus == false;
            console.log('pausing current song')
            cartSongPlayer.pause();

        } else {
            console.log('moved to new song')
            playingStatus == true;
            playingTrack = trackID
            cartSongPlayer.src = trackSource;
            cartSongPlayer.play();
        }
    //no song is playing
    } else {
        console.log('song is not playing')
        if (trackID == playingTrack) {
            playingStatus == true;
            console.log('resumed song')
            cartSongPlayer.play();

        } else {
            console.log('started new song')
            playingStatus == true;
            playingTrack = trackID
            cartSongPlayer.src = trackSource;
            cartSongPlayer.play();
        }
    }
}

Answer 1

您似乎在錯誤地使用==比較運算符，而不是=賦值運算符。

更改

playingStatus == true;

至

playingStatus = true;

Answer 2

您永遠不會更改playingStatus的值。

==是相等運算符，不是賦值運算符（ = ）。