gistfile1.txt

javascript:(function(){  function decodeBase64(str) {    try {      return decodeURIComponent(atob(str).split('').map(function(c) {        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);      }).join(''));    } catch (e) {      return "解码失败: " + e.message;    }  }  function getSelectedText() {    return window.getSelection().toString().trim();  }  function createSelectablePopup(content) {    var popup = document.createElement('div');    popup.style.cssText = `      position: fixed;      top: 20%;      left: 20%;      width: 60%;      max-height: 60%;      background: white;      border: 1px solid #ccc;      padding: 20px;      box-shadow: 0 0 10px rgba(0,0,0,0.5);      z-index: 1000;      overflow: auto;      white-space: pre-wrap;      word-wrap: break-word;    %60;        var closeButton = document.createElement('button');    closeButton.textContent = '关闭';    closeButton.style.cssText = %60      position: absolute;      top: 10px;      right: 10px;    %60;    closeButton.onclick = function() {      document.body.removeChild(popup);    };        var contentDiv = document.createElement('div');    contentDiv.textContent = content;    contentDiv.style.cssText = %60      margin-top: 30px;      user-select: text;    %60;        popup.appendChild(closeButton);    popup.appendChild(contentDiv);    document.body.appendChild(popup);  }  var selectedText = getSelectedText();  if (selectedText) {    var decoded = decodeBase64(selectedText);    createSelectablePopup("解码结果:\n" + decoded);  } else {    alert("请先选择要解码的Base64文本");  }})();