~~~ /** * 復制字符串 * @param str 字符串 * @param count 復制次數 * @returns {string} 結果字符串 * * repeatStr('abc',3) * abcabcabc */ function repeatStr(str, count) { let text = ''; for (let i = 0; i < count; i++) { text += str; } return text; } ~~~