如何使用eval运行javascript代码

如何使用eval运行javascript代码

这是我试过的

<div class="col-md-4 black" >

<% @unit.attempts.order("created_at DESC").each do |attempt| %>
<p ></p>
<p id="log"><%= attempt.body %></p>
<% end %>
</div>
<div class="col-md-4 run">
  <div class="view-lines">
    <h2>app.js</h2>
    <%= form_for [@unit, @attempt] do |f| %>
    <%= f.text_area :body,class: "editor"%>
    <%= f.submit "Run"%>
    <% end %>

<script>
  $(document).ready(function(){
    var code = $(".editor")[0];
    var editor = CodeMirror.fromTextArea(code,{
        lineNumbers: true,
        styleActiveLine: true,
        mode: "javascript",
        matchBrackets: true
    });
   });
    try {
  const v= $(item).find('.editor').val();
  const resultContainer = $('.black');
  const result = eval(v);
  
  resultContainer.innerHTML = result;
  } catch (error) {
  resultContainer.innerHTML = error;
  }
  </script>