undefined is not a function

具体报错

TypeError: c:\Users\Administrator\WebstormProjects\blogtest\views\index.ejs:1
 >> 1| <%- include header %>
    2| <form>
    3|   <div class="input-group">
    4|     <input type="text" class="form-control" placeholder="SEARCH" name="keyword">

undefined is not a function

这是因为我使用<% %>导入文件的时候，忘记写了后缀名.ejs 改成

<%- include header.ejs %>