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我有一个简单的代码片段，它在单击按钮时对文本框的内容进行 Base64 解码。

在 IE9 中加载时，它的工作方式与预期完全一样，但在 Firefox 12 中，单击该按钮不会执行任何操作。

代码在这里：

<html>
<head>
    <script type="text/javascript">

  var keyStr = "ABCDEFGHIJKLMNOP" +
               "QRSTUVWXYZabcdef" +
               "ghijklmnopqrstuv" +
               "wxyz0123456789+/" +
               "=";

  function decode64(input) {
     var output = "";
     var chr1, chr2, chr3 = "";
     var enc1, enc2, enc3, enc4 = "";
     var i = 0;

     // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
     var base64test = /[^A-Za-z0-9\+\/\=]/g;
     if (base64test.exec(input)) {
        alert("There were invalid base64 characters in the input text.\n" +
              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
              "Expect errors in decoding.");
     }
     input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

     do {
        enc1 = keyStr.indexOf(input.charAt(i++));
        enc2 = keyStr.indexOf(input.charAt(i++));
        enc3 = keyStr.indexOf(input.charAt(i++));
        enc4 = keyStr.indexOf(input.charAt(i++));

        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;

        output = output + String.fromCharCode(chr1);

        if (enc3 != 64) {
           output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
           output = output + String.fromCharCode(chr3);
        }

        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";

     } while (i < input.length);

     return unescape(output);
  }
String.prototype.trim = function() {
        return this.replace(/^\s+|\s+$/g,"");
}
function decodeHtml(){
        var contentdiv = document.getElementById("html");
        var targetdiv = document.getElementById("target");
        targetdiv.innerHTML = decode64(contentdiv.innerHTML.trim());
}
        </script>
</head>
        <body>
                <textarea id="html">
                </textarea>
                <button onClick="decodeHtml()">Decode</button><br><br>
                <div id="target"></div>
        </body>
</html>
4

1 回答 1

4

不应该是最后一行：

targetdiv.innerHTML = decode64(contentdiv.innerHTML.trim());

是：

targetdiv.innerHTML = decode64(contentdiv.value.trim());

jsFiddle 示例。

于 2012-05-29T21:04:30.307 回答