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function createLi(value) {
  var html = '';

  if (Array.isArray(value)) {
    value.forEach(function (value) {
      html += '<li>' + value + '</li>';
    });
  }
  else if (typeof value === 'string') {
    html = '<li>' + value + '</li>';
  }
  else {
    console.log('不正な引数です');
  }

  return html;
}

var htmlA = createLi(['foo', 'bar', 'baz']);
var htmlB = createLi('foo');

console.log(htmlA);
// <li>foo</li><li>bar</li><li>baz</li>
console.log(htmlB);
// <li>foo</li>