Javascript 中非常奇怪的行為。 代碼運行不正常

Question

我無法描述這一點，因為我無法重新創建任何孤立的實例。 在 if 語句中設置布爾值會在到達 if 語句之前設置。 我認為這與控制台出現亂序有關，但我現在可以在 j for 循環中看到結果，除非我刪除notesObj.trans.all.combined[i].played = true 。

if(shapesNotes.length === 2){
    if(shapesNotes[1].trans.all.combined.length == 2){
        console.log("troubled value = " + shapesNotes[1].trans.all.combined[1].played)
    }

}

function setTranspositionsForAllNotes(notesObj,debugIndex){

    for(var i=0; i<notesObj.trans.all.combined.length; ++i){
        var transNoteAt = notesObj.trans.all.combined[i].noteAt
        var transPlayed = notesObj.trans.all.combined[i].played
        
        console.log("debugIndex = " + debugIndex + "   i = " + i)
        console.log("notesObj.trans.all.combined.length = " +notesObj.trans.all.combined.length)
        console.log("notesObj.trans.all.combined["+i+"].played = " + notesObj.trans.all.combined[i].played)
        console.log("shapesNotes["+debugIndex+"].trans.all.combined["+i+"].played = " + shapesNotes[debugIndex].trans.all.combined[i].played)

        console.log("noteAt = "  + noteAt + " transNoteAt = "  + transNoteAt)

        if(transPlayed === false && 
           noteAt >= transNoteAt){
           
           var transInterval = notesObj.trans.all.combined[i].interval

           for(var j=0; j<notesObj.trans.array.length; ++j){
             notesObj.trans.array[j] += transInterval
             notesObj.trans.freqsPlusTrans[j] = getFrequencyPlusTranspositionForFreqIndex(notesObj,j)
           }
           
           console.log("transInterval = " + transInterval + " for " + debugIndex + "   i = " + i)
          

           notesObj.trans.all.combined[i].played = true
           
        
        }
    
    }
        
}

var debugIndex = 0;
shapesNotes.forEach(function(shapeNotes) {
    setTranspositionsForAllNotes(shapeNotes,debugIndex)
            
    debugIndex+=1
});

只是為了包括我的日志顯示的內容，這里是：

1980 troubled value = false
1981 debugIndex = 0   i = 0
1982 notesObj.trans.all.combined.length = 2
1983 notesObj.trans.all.combined[0].played = false
1984 shapesNotes[0].trans.all.combined[0].played = false
1986 noteAt = 0.008333333333333333 transNoteAt = 0
1998 transInterval = 0 for 0   i = 0
1981 debugIndex = 0   i = 1
1982 notesObj.trans.all.combined.length = 2
1983 notesObj.trans.all.combined[1].played = false
1984 shapesNotes[0].trans.all.combined[1].played = false
1986 noteAt = 0.008333333333333333 transNoteAt = 0
1998 transInterval = 2 for 0   i = 1
1981 debugIndex = 1   i = 0
1982 notesObj.trans.all.combined.length = 2
1983 notesObj.trans.all.combined[0].played = false
1984 shapesNotes[1].trans.all.combined[0].played = false
1986 noteAt = 0.008333333333333333 transNoteAt = 0
1998 transInterval = 0 for 1   i = 0
1981 debugIndex = 1   i = 1
1982 notesObj.trans.all.combined.length = 2
1983 notesObj.trans.all.combined[1].played = true
1984 shapesNotes[1].trans.all.combined[1].played = true
1986 noteAt = 0.008333333333333333 transNoteAt = 0

請注意，根據日志，我的“問題值”對於 shapeNotes[1] for combine[1] 設置為 false，但是當它在我的第一個 for 循環中達到該值時，它立即以某種方式設置為 true 並且內部的 j for 循環或控制台日志永遠不會發生。 奇怪的是， transPlayed === false && noteAt >= transNoteAt條件中的布爾設置notesObj.trans.all.combined[i].played = true立即發生，同時該條件中的其他代碼都不是執行，即使我設置了斷點。

Answer 1

也許你應該把 ++i 改為 i++