类型脚本在数组中计数重复项并按每个项的计数对结果进行排序

let array = ["9777", "9777", "2.4", "9777", "2.4", "2.4", "9777", "2.4", "2.4", "9777", "9777", "2.4", "2.4", "2.4"],
    counts = Object.values(array.reduce((a, c) => {
      (a[c] || (a[c] = {name: c, count: 0})).count += 1;
      return a;
    }, {})).sort(({count: ac}, {count: bc}) => bc - ac),
    target = "2.4",
    found = counts.find(({name}) => name === target);

console.log(counts);
console.log(found);
console.log(found.count);

.as-console-wrapper { max-height: 100% !important; top: 0; }

const items = ["9777", "9777", "2.4", "9777", "2.4", "2.4", "9777", "2.4", "2.4", "9777", "9777", "2.4", "2.4", "2.4"];

// A place to store the results
const result = [];

// Create a unique list of items to loop over
// Add each item to the result list
[...new Set(items)].forEach(item => result.push({
  key: item,
  // Get the count of items of the current type
  count: items.filter(i => i == item).length
}));

// Sort the array from highest to lowest
result.sort((a, b) => b.count - a.count);

console.log(result);