About the declaration method of two-dimensional array in JS

As shown below:

var myarr=new Array(); //先声明一维
for(var i=0;i<2;i++){  //一维长度为2
  myarr[i]=new Array(); //再声明二维
  for(var j=0;j<3;j++){  //二维长度为3
    myarr[i][j]=i+j;  // 赋值，每个数组元素的值为i+j
  }
}

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