如何制作一个字符串变量，这是通过它的数字进行的？例如，大写A为65。ASCII图表

Question

我想拥有它，以便提示用户输入第二个字符串，该字符串将比第一个字符串以比第一个字符串较低。我不明白如何使字符串成为一个数字？我什至需要这样做吗？

function SortStringAlphabetically() {
  // Declare variables
  var stringOne = "";
  var stringTwo = "";
  var output;
  

  // Get input from user
  stringOne = prompt("Please enter a string");
  stringTwo = prompt("Please enter enter a string that will sort lower alphabetically than the first string.");

  // Convert input strings to numbers
  stringOne = Number(stringOne);
  stringTwo = Number(stringTwo);

  if ( stringTwo > stringOne) {
    output = "very good" + stringOne + "sorts lower than" + stringTwo + ".";
  } else {
    output = stringOne + "sorts higher than" + stringTwo + "try again";
  }

  document.write(output);
}

// Run the program
SortStringAlphabetically();
// END OF YOUR CODE