玉出乎意料的长度错误

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

我收到以下错误：

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

显然您还没有将userlist对象发送给Jade。 您需要像这样渲染它：

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

当第三次出现userlist有你的对象。