js 数组中随机出来N组

var word = [];

while (word.length < 7) {
  var tmp = data[parseInt(Math.random() * data.length)];
  var isStop = false;
  for (var i = 0; i < word.length; i++) {
    if (word[i] == tmp) {
      isStop = true;
      break;
    }
  }
  if (!isStop)
    word[word.length] = tmp;
}
$scope.searchWord = angular.copy(word);