Javascript 前缀操作中的左侧表达式无效

我有一个javascript，它应该在点击按钮时创建指向文本文件的下载链接，但是我得到了一个“无效的左侧表达式”错误

js如下所示：

(function () {
  var textFile = null,
  var makeTextFile = function (text) {
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null) {
      window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);
    return textFile;
  };

  var create = document.getElementById('create');

  create.addEventListener('click', function () {
    var link = document.getElementById('downloadlink');
    link.href = makeTextFile({{request_string}});
    link.style.display = 'block';
  }, false);
})();

----------------Request File Generated 2015-06-30 17:23:16.324439------------------
     WINDOW_START    |      WINDOW_END     |       DURATION      |         SAT         |         TYPE        |       PRIORITY      |             
--------------------------------------------------------------------------------
 2015/01/02 00:00:00 | 2015/01/22 00:00:00 |         500         |          F7         |       NOMINAL       |          5          |  

<div class="panel panel-body">
      <button id="create">Create file</button> 
      <a download="info.txt" id="downloadlink" style="display: none">Download</a>
</div>

我也尝试过这样做：

var text_string = {{request_string}}
link.href = makeTextFile(text_string);

其中

{{request\u string}}

如下所示：

(function () {
  var textFile = null,
  var makeTextFile = function (text) {
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null) {
      window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);
    return textFile;
  };

  var create = document.getElementById('create');

  create.addEventListener('click', function () {
    var link = document.getElementById('downloadlink');
    link.href = makeTextFile({{request_string}});
    link.style.display = 'block';
  }, false);
})();

----------------Request File Generated 2015-06-30 17:23:16.324439------------------
     WINDOW_START    |      WINDOW_END     |       DURATION      |         SAT         |         TYPE        |       PRIORITY      |             
--------------------------------------------------------------------------------
 2015/01/02 00:00:00 | 2015/01/22 00:00:00 |         500         |          F7         |       NOMINAL       |          5          |  

<div class="panel panel-body">
      <button id="create">Create file</button> 
      <a download="info.txt" id="downloadlink" style="display: none">Download</a>
</div>

html如下所示：

(function () {
  var textFile = null,
  var makeTextFile = function (text) {
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null) {
      window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);
    return textFile;
  };

  var create = document.getElementById('create');

  create.addEventListener('click', function () {
    var link = document.getElementById('downloadlink');
    link.href = makeTextFile({{request_string}});
    link.style.display = 'block';
  }, false);
})();

----------------Request File Generated 2015-06-30 17:23:16.324439------------------
     WINDOW_START    |      WINDOW_END     |       DURATION      |         SAT         |         TYPE        |       PRIORITY      |             
--------------------------------------------------------------------------------
 2015/01/02 00:00:00 | 2015/01/22 00:00:00 |         500         |          F7         |       NOMINAL       |          5          |  

<div class="panel panel-body">
      <button id="create">Create file</button> 
      <a download="info.txt" id="downloadlink" style="display: none">Download</a>
</div>

创建文件
下载

{{request\u string}}

是str类型，所以我不确定问题出在哪里。谁能告诉我我做错了什么

---

谢谢

我最终使用了

document.getElementsByTagName（'pre'）

而不是试图传入一个包含字符串的变量。

是否将

{request\u string}}

扩展为包含正确引号的内容？如果没有，您可能有无效的JavaScript。错误消息是否未链接到特定的代码行？您是什么意思，“

{{request\u string}

看起来像这样”？它来自哪里？您是在脚本文件上使用模板引擎还是什么？如果是这样的话，那是哪一个呢？看起来像是使用了一个模板引擎，就像@Bergi所说的，所以你需要引用它：

link.href=makeTextFile（“{request_string}”）@klwahl:这可能与