如何在字符串中的每个字符之间生成随机字符？

function generateRandomString(str) {
  var charArray = str.split('');
  var randomString = '';

  for (var i = 0; i < charArray.length; i++) {
    var randomChar = generateRandomChar();
    randomString += randomChar + charArray[i];
  }

  return randomString;
}

function generateRandomChar() {
  var charSet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  var randomIndex = Math.floor(Math.random() * charSet.length);
  return charSet[randomIndex];
}

var originalString = 'Hello World';
var result = generateRandomString(originalString);
console.log(result);