将元素从二维数组复制到另一个数组

Question

我一直在尝试将多维数组中的元素复制到另一个数组中。 我的目标是从第一个数组“bikeBrands”中获取元素并尝试将它们放入新数组“bikeBrands2”但“bikeBrands2”一直未定义。

  const bikeBrands = [];
  bikeBrands[0] = ['Susuki', 'Kawasaki'];
  bikeBrands[1] = ['Honda', 'KTM'];

  const bikeBrands2 = [];

  for (var i = 0; i < bikeBrands.lenght; i++)
    bikeBrands2[i] = bikeBrands[i].slice();


  console.log(bikeBrands2);

Answer 1

您在长度关键字中输入了一个错字。 这就是问题所在。

for (var i = 0; i < bikeBrands.length; i++)
bikeBrands2[i] = bikeBrands[i].slice();

console.log(bikeBrands2);

Output：

[ [ 'Susuki', 'Kawasaki' ], [ 'Honda', 'KTM' ] ]

Answer 2

您可以使用 concat function 并在不使用 boocle 的情况下使用 seconde 出现第一个数组

let bikeBrands = [];
bikeBrands[0] = ['Susuki', 'Kawasaki'];
bikeBrands[1] = ['Honda', 'KTM'];

let bikeBrands2 = [];
        
bikeBrands2 = bikeBrands2.concat(bikeBrands);

console.log(bikeBrands2);

Answer 3

最佳实践是使用扩展运算符。 干杯

 const bikeBrands = []; bikeBrands[0] = ['Susuki', 'Kawasaki']; bikeBrands[1] = ['Honda', 'KTM']; const copybikeBrands = [...bikeBrands]; console.log("the copy", copybikeBrands)