在 Javascript 中添加字符串 returns 空字符串

Question

我的目标是此功能 return 仅“03.12.21，16:12:52”。目前只有“]”被return编辑。

let txt = `[03.12.21, 16:12:52] Firstname Lastname: Some text [03.12.21, 16:14:30] Firstname Lastname: Some text`;

console.log(parseDate()); // "]"

function parseDate() {
  for (let i = 0; i < txt.length; i++) {
    let char = txt[i];
    let date = "";
    date += char;
    if (char === "]") {
      return date;
    }
  }
}

Answer 1

将 let date = ""; 移出循环（每次迭代都将其重置）

let txt = `[03.12.21, 16:12:52] First Name: Some text [03.12.21, 16:14:30] Felix Krückel: Some text`;

console.log(parseDate()); // "]"

function parseDate() {
  let date = "";
  for (let i = 0; i < txt.length; i++) {
    let char = txt[i];
    date += char;
    if (char === "]") {
      return date;
    }
  }
}