Javascript 不读取以 0 开头的数组项

Question

我想给遗传算法一个机会，但我似乎找不到解决这个问题的方法。

这是我的代码:

var encodings = {
  0000: 0,
  0001: 1,
  0010: 2,
  0011: 3,
  0100: 4,
  0101: 5,
  0110: 6,
  0111: 7,
  1000: 8,
  1001: 9,
  1010: "+",
  1011: "-",
  1100: "*",
  1101: "/"
};
var chromosome = "";

for (var i = 0; i < 36; i++) {
  chromosome += Math.round(Math.random());
}

var chromArray = chromosome.match(/.{1,4}/g);

document.write(chromArray + "<br>");

for (var o = 0; o < 9; o++) {
  document.write(encodings[chromArray[o]]);
}

如果运行代码，您会看到输出中有很多未定义的内容。什么会导致这种情况？

谢谢!

Answer 1

您应该将对象的键转换成字符串

应该是:

var encodings = 
{
  "0000": 0,
  "0001": 1,
  "0010": 2,
  "0011": 3,
  "0100": 4,
  "0101": 5,
  "0110": 6,
  "0111": 7,
  "1000": 8,
  "1001": 9,
  "1010": "+",
  "1011": "-",
  "1100": "*",
  "1101": "/"
};

var chromosome = "";

for (var i = 0; i < 36; i++) 
{
  chromosome += Math.round(Math.random());
}

var chromArray = chromosome.match(/.{1,4}/g);

document.write(chromArray + "<br>");

for (var o = 0; o < 9; o++) 
{
  document.write(encodings[chromArray[o]]);
}