我一直在用JavaScript编写一个数独解算器。有一个非常奇怪的行为。下面是代码和上下文：

solveSudoku = ()=>{
      let sectionsCopy_ =sectionsCopy

      for(let sect =0; sect< 9; sect++){
        for(let box =0; box <9; box++){
          if(sectionsCopy[sect][box] === ''){
            for(let num=1; num<=9;num++){
              if(this.isPossible(sect,box,num)){
                sectionsCopy[sect][box]=''+num
                this.solveSudoku()
                sectionsCopy[sect][box]=''

              }
            }
            return
          }
        }
      }
      debugger
      console.log(sectionsCopy)

  }

这是在类内

***sectionsCopy***是全局变量
***sectionsCopy_***仅用于调试（以便轻松查看全局var的值）
***isPossible（）***是一个函数，用于确定num在该位置是否有效
***sect***是数独中3x3正方形的索引
***box***是数独中单元框的索引

问题：

请看下面的数独游戏：

单击求解时，sectionsCopy 变量将存储：

[
     ["2","6","" ,"4","7","" ,"5","8","1"],
     ["" ,"" ,"3","" ,"" ,"" ,"" ,"" ,"4"],
     ["" ,"1","5","" ,"" ,"8","7","6","3"],
     ["" ,"3","" ,"" ,"" ,"6","" ,"" ,"8"],
     ["4","8","9","" ,"" ,"2","3","1","" ],
     ["" ,"7","" ,"8","3","" ,"" ,"" ,"" ],
     ["6","9","" ,"3","" ,"" ,"" ,"1","" ],
     ["" ,"" ,"8","" ,"9","" ,"5","" ,"" ],
     ["" ,"" ,"7","2","" ,"" ,"" ,"9","6"]
]

当我在没有调试器的情况下运行它时，我得到了以下结果：

如果我打开调试器，我会看到：

以下是我不使用调试器时与使用调试器时的结果：

我希望调试器下的行为与没有调试器时的行为相同（否则像这种情况下将毫无用处）
我尝试了console.log(sectionsCopy_)，但我知道数组是不可变的，所以这无关紧要