Underscore.js 1.7の使い方 Collections編 each

var r = document.getElementById("r");
  _.each([1, 2, 3], function(i) {
  r.innerHTML += i + '
';
});
// => 1

// => 2

// => 3

var r2 = document.getElementById("r2");
  _.each({one: 1, two: 2, three: 3}, function(key, value) {
  r2.innerHTML += key + ': ' + value + '
';
});
// => 1: one

// => 2: two

// => 3: three