我是 JavaScript 的新手，當我length鍵入lenght. 但是，沒有針對此錯誤或語法錯誤的通知。我花了很長時間調試。我想知道這怎么會發生？如果lenghtJavaScript 可以接受？var totalFruit = function(tree) {        let windowStart = 0;    let dict = {};    maxLength = 0;    for (let windowEnd = 0; windowEnd < tree.length; windowEnd++) {         currentFruit = tree[windowEnd];        if (!(currentFruit in dict)) {            dict[currentFruit] = 0;        }        dict[currentFruit] += 1;         while (Object.keys(dict).lenght > 2) {            leftFruit = tree[windowStart];            dict[leftFruit] -= 1;            if (dict[leftFruit] == 0) {                delete dict[leftFruit]            windowStart += 1;            }        }        maxLength = Math.max(maxLength, windowEnd - windowStart + 1);         }    return maxLength;};