Existe-t-il un équivalent JavaScript de in_array() de PHP ?

// jQuery implementation:
function inArray(needle, haystack) {
  for (var i = 0; i < haystack.length; i++) {
    if (haystack[i] == needle) return true;
  }
  return false;
}

function arrayCompare(a1, a2) {
  if (a1.length != a2.length) return false;
  for (var i = 0; i < a1.length; i++) {
    if (a1[i] !== a2[i]) return false;
  }
  return true;
}

function inArray(needle, haystack) {
  for (var i = 0; i < haystack.length; i++) {
    if (typeof haystack[i] == 'object') {
      if (arrayCompare(haystack[i], needle)) return true;
    } else {
      if (haystack[i] == needle) return true;
    }
  }
  return false;
}

// Test the custom function:
var a = [['p', 'h'], ['p', 'r'], 'o'];
if (inArray(['p', 'h'], a)) {
  console.log('ph was found');
}
if (inArray(['f', 'i'], a)) {
  console.log('fi was found');
}
if (inArray('o', a)) {
  console.log('o was found');
}