javascript - 从选择中捕获变量名称

Question

在后端，我编写了一些代码来读取文件并输出到 JavaScript 数组列表，例如，页面将看到:

<script>
  var peanuts = ["1","s","g","3","n"];
  var cashewNuts = ["d","a","f","d","n"];
  var PecanNuts = ["6","m","3","x","m"];
  var BrazilNuts = ["j","n","7","v","s"];
  var goingNuts = ["a","e","7","m","y"];
</script>

然后我想使用基于该页面中其他位置的值的数组。

例如:

if($('select').val()===0){
   alert(firstArray[1]);
}

我的问题是变量名称是根据读取文件中包含的内容决定的，我不知道这些信息。有没有办法举例说明

//collect the value from the select and assign it to a var
var varN = $('select').val();
//then collect another variable that has the variable name that 
//equals the value of the 'varN'

我知道这看起来很可怕，但不幸的是，根据我需要做的事情，这就是我需要做的:(

Answer 1

是的。例如，如果您的变量在全局范围内，您可以这样做

var val = window[varN][0]; 获取花生:1

如果你这样做

var nuts = {
  peanuts : ["1","s","g","3","n"],
  cashewNuts : ["d","a","f","d","n"],
  PecanNuts : ["6","m","3","x","m"],
  BrazilNuts : ["j","n","7","v","s"],
  goingNuts : ["a","e","7","m","y"]
}

然后你就可以使用

var val = nuts[varN][0];