javascript - 当函数在 Javascript 中将 Bool 值设置为 true 时，它​​返回 false

Question

我面临这个问题，在准备好的文档中创建了一个音频播放器，并创建了一个用于播放 false 的 var，但每次函数似乎都被正确调用，但没有将该变量设置为 true: 代码是这样的，该函数是从点击监听器调用的。

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

您似乎错误地使用了 == 比较运算符，而不是 = 赋值运算符。

改变

playingStatus == true;

至

playingStatus = true;