js表单输入在线解密实用工具

使用方法

function decrypt(isDecrypt) {
  var shiftText = document.getElementById("shift").value;
  var shift = parseInt(shiftText, 10);
  if (isDecrypt) shift = (26 - shift) % 26;
  var textElem = document.getElementById("inputText");
  textElem.value = caesarShift(textElem.value, shift);
}

function caesarShift(text, shift) {
  var shift = parseInt(shift, 10);
  var result = "";

  for (var i = 0; i < text.length; i++) {
    var c = text.charCodeAt(i);

    if (65 <= c && c <= 90)
      result += String.fromCharCode(((c - 65 + shift) % 26) + 65);
    // Uppercase
    else if (97 <= c && c <= 122)
      result += String.fromCharCode(((c - 97 + shift) % 26) + 97);
    // Lowercase
    else result += text.charAt(i);
  }
  var textElem = document.getElementById("inputText");
  textElem.value = result;
  return result;
}

document.getElementById("clipboard").addEventListener("click", copyToClipboard);

function copyToClipboard() {
  let textArea = document.createElement("textarea");
  const emptyResultField = inputText.value;

  if (!emptyResultField) {
    return;
  }
  textArea.value = inputText.value;
  document.body.appendChild(textArea);
  textArea.select();
  document.execCommand("Copy");
  textArea.remove();

  alert("Caesaris codice copied to clipboard!");
}