An example that shows Array.prototype.sort sorts strings in unicode order.

sort_non_ascii_strings.js

var sorted = ["山田", "佐藤", "鈴木", "石田"].sort().map(function (name) {
  var code = name.split('').map(function (letter) {
    return letter.charCodeAt(0);
  }).join(' ');
  return name + ' -> ' + code;
});

console.log(sorted);