如何重复一个字符串以匹配另一个字符串的长度？

function repeatString(source, target) {
  var repeatedString = source;
  while (repeatedString.length < target.length) {
    repeatedString += source;
  }
  return repeatedString;
}

var sourceString = "abc";
var targetString = "defg";
var result = repeatString(sourceString, targetString);
console.log(result); // 输出：abcabcabc

source_string = "abc"
target_string = "defg"
result = source_string * (len(target_string) // len(source_string)) + source_string[:len(target_string) % len(source_string)]
print(result)  # 输出：abcabcabc