在句子中找出最长的单词，并返回它的长度。

function findLongestWord(str) {

  var arr = str.split(" ");
  var a = [];
  for (var i in arr) {
    a.push(arr[i].length);
  }

  return a.sort(function (a, b) {
    return b-a;
  })[0];
}

findLongestWord("The quick brown fox jumped over the lazy dog");

findLongestWord("The quick brown fox jumped over the lazy dog") 应该返回一个数字

findLongestWord("The quick brown fox jumped over the lazy dog") 应该返回 6

findLongestWord("May the force be with you") 应该返回 5.

findLongestWord("Google do a barrel roll")应该返回 6.

findLongestWord("What is the average airspeed velocity of an unladen swallow")应该返回 8.

findLongestWord("What if we try a super-long word such as otorhinolaryngology") 应该返回 19.