一个选项是使用 Number 构造函数，该构造函数返回数字或 NaN :

One option is using the Number constructor which returns a number or NaN:

var res = q.split(',').map(el => {
  let n = Number(el);
  return n === 0 ? n : n || el;
});

// > "The, 1, 2, Fox, Jumped, 3.33, Over, -0"
// < ["The", 1, 2, " Fox", " Jumped", 3.33, " Over", -0]

如果上述情况令人困惑，则可以用Bergi建议的以下条件替换它:

edit: If the above condition is confusing you can replace it with the following condition which was suggested by Bergi:

return isNaN(n) ? el : n;

如果要修剪字符串元素，还可以使用 String.prototype.trim 方法:

In case that you want to trim the string elements you can also use the String.prototype.trim method:

return isNaN(n) ? el.trim() : n;