我正在尝试编写一个基本的 javascript 函数来查找字符串中最长的单词并记录它的长度.
I am trying to write a basic javascript function to find the longest word in a string and log it's length.
到目前为止我有:
function findLongestWord(str) { var words = []; var longest = []; words.push(str.split(" ")); for(var i = 0; i < words.length; i++){ if (words[i].length > longest[0].length){ longest.push(words[i]); } } return longest[0].length; } findLongestWord('The quick brown fox jumped over the lazy dog');这对我来说很有意义，但它给了我一个错误.我尝试了 console.logging 每个步骤，但它在 for 循环周围失败了.
It makes perfect sense to me, yet it gives me an error. I tried console.logging each step and it fails around the for loop.
推荐答案使用words.push(str.split(" "))时，数组words看起来像
[ ["The", "quick", "brown", "fox", "jumped", "over", "the", "lazy", "dog"] ]另一个问题是，当您在for 中检查longest[0].length 的第一次迭代时，它是undefined.导致错误
Another problem is that when you check longest[0].length for the first iteration in the for, it is undefined. Which results in the error
未捕获的类型错误:无法读取未定义的属性长度"
Uncaught TypeError: Cannot read property 'length' of undefined
要解决这个问题，您可以使用 longest 作为 string 而不是 array.并在 for 中，将 length 大于当前 longest 字符串的字符串分配给它.
To solve this, you can use longest as string instead of array. And in the for, assign the string having the length greater than the current longest string to it.
在函数的最后，可以返回最长的字符串.
At the end of the function, you can return the longest string.
问题/建议: