玉意想不到的长度错误

Question

我该如何处理这个问题？我的玉文件是：

extends layout 

block content 
    h1. 
     User List 
    ul 
     each user, i in userlist 
      li 
       a(href="mailto:#{user.email}")= user.username 

我得到以下错误：

TypeError: C:\node\nodetest1\views\userlist.jade:7 
    5|   User List 
    6|  ul 
    > 7|   each user, i in userlist 
    8|    li 
    9|     a(href="mailto:#{user.email}")= user.username 

Cannot read property 'length' of undefined 
    at eval (eval at <anonymous> (C:\node\nodetest1\node_modules\jade\lib\jade.js:174:8), <anonymous>:56:31) 
    at eval (eval at <anonymous> (C:\node\nodetest1\node_modules\jade\lib\jade.js:174:8), <anonymous>:99:4) 
    at eval (eval at <anonymous> (C:\node\nodetest1\node_modules\jade\lib\jade.js:174:8), <anonymous>:112:22) 
    at res (C:\node\nodetest1\node_modules\jade\lib\jade.js:175:38) 
    at Object.exports.render (C:\node\nodetest1\node_modules\jade\lib\jade.js:300:10) 
    at Object.exports.renderFile (C:\node\nodetest1\node_modules\jade\lib\jade.js:336:18) 
    at View.exports.renderFile [as engine] (C:\node\nodetest1\node_modules\jade\lib\jade.js:321:21) 
    at View.render (C:\node\nodetest1\node_modules\express\lib\view.js:76:8) 
    at Function.app.render (C:\node\nodetest1\node_modules\express\lib\application.js:527:10) 
    at ServerResponse.res.render (C:\node\nodetest1\node_modules\express\lib\response.js:900:7) 

Answer 1

显然还没有发送userlist对象玉。你需要使它像这样：

res.render('userlist', {userlist: userlist}); 

凡userlist第三次出现有你的对象。