迭代数组时“无法读取未定义的属性‘长度’”

编程问答 2022-05-30

问题描述

我正在尝试使用 express 遍历对象数组。

这是 Pug 中的迭代。

each thing in things
    div.Test
        div= thing.name
        div= thing.id

这就是 Express 路线的样子。

app.get("/",async (req,res) => {
  const things = [
    {
      name: "Foo bar",id: 1,},{
      name: "Another foo bar",id: 2,{
      name: "Here we go again",id: 7888822,];

  res.render("index",{
    things: things,});
});

在迭代过程中，我可以看到控制台会吐出这些错误消息。

Cannot read property 'length' of undefined
    at eval (eval at wrap (/this/is/not/the/real/path/node_modules/pug-runtime/wrap.js:6:10),<anonymous>:97:32)
    at eval (eval at wrap (/this/is/not/the/real/path/node_modules/pug-runtime/wrap.js:6:10),<anonymous>:128:4)
    at template (eval at wrap (/this/is/not/the/real/path/node_modules/pug-runtime/wrap.js:6:10),<anonymous>:131:7)
    at Object.exports.renderFile (/this/is/not/the/real/path/node_modules/pug/lib/index.js:452:38)
    at Object.exports.renderFile (/this/is/not/the/real/path/node_modules/pug/lib/index.js:442:21)
    at View.exports.__express [as engine] (/this/is/not/the/real/path/node_modules/pug/lib/index.js:491:11)
    at View.render (/this/is/not/the/real/path/node_modules/express/lib/view.js:135:8)
    at tryRender (/this/is/not/the/real/path/node_modules/express/lib/application.js:640:10)
    at Function.render (/this/is/not/the/real/path/node_modules/express/lib/application.js:592:3)
    at ServerResponse.render (/this/is/not/the/real/path/node_modules/express/lib/response.js:1012:7)

解决方法

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