Using non-ASCII character as JavaScript object key

You can use a subscript to reference the object:

> var obj = {
  'ア' : 'testing',
  'ダ' : '2015-5-15',
  'ル' : 123,
  'ト' : 'Good'
};
> undefined
> obj['ア']
> "testing"

You should also not that object keys and values in JavaScript objects are separated by :(colons) not => (fat commas)

You can use property accessors:

obj['ト']

Example:

var obj = {
  'ア': 'testing',
  'ダ': '2015-5-15',
  'ル': 123,
  'ト': 'Good'
};

console.log(obj['ト']);
> Good

MDN: Property Accessors

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