如何使用javascript从多个连续跨度中获取单个组合字符串

function getCombinedString(spans) {
  let combinedString = '';

  for (let i = 0; i < spans.length; i++) {
    const start = spans[i].start;
    const end = spans[i].end;

    for (let j = start; j <= end; j++) {
      combinedString += String.fromCharCode(j);
    }
  }

  return combinedString;
}

// 示例用法
const spans = [
  { start: 65, end: 67 }, // 跨度1: A, B, C
  { start: 97, end: 99 }, // 跨度2: a, b, c
  { start: 48, end: 50 }, // 跨度3: 0, 1, 2
];

const result = getCombinedString(spans);
console.log(result); // 输出: ABCabc012