我有这个ejs文件，该文件将在node.js中使用res.render（）作为响应发送
<!DOCTYPE html>
<html>
<head>
<title>pilcit</title>
</head>
<body>
<% var btn = document.getElementById('btn');%>
<% btn.style.background="blue"; %>
<div class="pt-5">
<div class="container-fluid">
<h1 style="color:blue;" align=center>Pilcit</h2>
<h4 style="color:#369bf4" align="center">The online clipboard</h4>
<div>
<textarea class="form-control mt-5" name="content" rows="12">
<%= result.content %>
</textarea>
<input type="text" value="sdfdsfsdfsd" id="foo">
<button id="btn" data-clipboard-target="#foo" copy clip </button>
</div>
<!--<input type="submit" value="Create Clip">-->
</div>
但行
`<％var btn = document.getElementById（'btn'）;％>
给我这个错误
ReferenceError: /home/ubuntu/workspace/pilcit/views/show.ejs:34
32| </head>
33| <body>
>> 34| <% var btn = document.getElementById('btn');%>
35| <div class="pt-5">
36|
37| <div class="container-fluid"> …