错误：无法读取null的属性(阅读'name')当使用ejs与nodejs

ttygqcqt 于 2023-05-28 发布在 Node.js

关注(0)|答案(1)|浏览(182)

这个错误发生在我使用ejs的时候，否则它在fetch请求或postman请求中工作正常。它只发生在品牌数据上，当我使用ejs时，它在第一个请求中发出双重请求，它向客户端发送数据，但在第二个请求中它发送null，这就是错误发生的原因，但不知道为什么它发送null并发出双重请求。

后台

const brandId = req.params.id;
  const brand = await Brand.findOne({ _id: brandId });
  const vehicles = await Vehicle.find({ brand: brandId });
  console.log(brand);
  res.render("brand", { brand, vehicles });

前端

<!DOCTYPE html>
<html lang="en">
  <head>
    <%- include('partials/_head'); %>
    <title>Home</title>
  </head>
  <body>
    <%- include('partials/_header'); %>
    <div class="container">
      <main>
        <section class="showcase">
          <div class="showcase-brand">
            <div class="brand-title"><%= brand.name %> vehicles</div>
            <div class="brand-logo">
              <img src="<%= brand.image %>" alt="brand-logo" />
            </div>
          </div>
        </section>
        <section class="brand-vehicles">
          <div class="brand-vehicles-list">
            <% vehicles.forEach(vehicle => { %>
            <a href="#" class="brand-vehicle">
              <img
                src="https://s7d1.scene7.com/is/image/hyundai/2023-sonata-hybrid-limited-ultimate-red-019:Vehicle-Carousel?fmt=webp-alpha"
                alt="vehicle-img"
              />
              <p><%= vehicle.name %></p>
            </a>
            <% }) %>
          </div>
        </section>
      </main>
      <%- include('partials/_sidebar'); %>
    </div>
  </body>
</html>

控制台日志

Server is running on port:3000...
`{
  _id: 'tesla',
  name: 'tesla',
  image: 'https://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Tesla_Motors.svg/800px-Tesla_Motors.svg.png',
  createdAt: 2023-05-23T08:21:27.743Z,
  updatedAt: 2023-05-23T08:21:27.743Z,
  __v: 0
}
null
TypeError: C:\Users\winne\Documents\wikiwheels\views\brand.ejs:13
    11|         <section class="showcase">
    12|           <div class="showcase-brand">
 >> 13|             <div class="brand-title"><%= brand.name %> vehicles</div>
    14|             <div class="brand-logo">
    15|               <img src="<%= brand.image %>" alt="brand-logo" />
    16|             </div>

Cannot read properties of null (reading 'name')
    at eval ("C:\\Users\\winne\\Documents\\wikiwheels\\views\\brand.ejs":18:32)
    at brand (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:703:17)
    at tryHandleCache (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:274:36)
    at exports.renderFile [as engine] (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:491:10)
    at View.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\view.js:135:8)
    at tryRender (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\application.js:657:10)
    at Function.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\application.js:609:3)
    at ServerResponse.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\response.js:1039:7)
    at getBrand (C:\Users\winne\Documents\wikiwheels\controller\brand.js:23:7)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  path: 'C:\\Users\\winne\\Documents\\wikiwheels\\views\\brand.ejs'
}
null
TypeError: C:\Users\winne\Documents\wikiwheels\views\brand.ejs:13
    11|         <section class="showcase">
    12|           <div class="showcase-brand">
 >> 13|             <div class="brand-title"><%= brand.name %> vehicles</div>
    14|             <div class="brand-logo">
    15|               <img src="<%= brand.image %>" alt="brand-logo" />
    16|             </div>

Cannot read properties of null (reading 'name')
    at eval ("C:\\Users\\winne\\Documents\\wikiwheels\\views\\brand.ejs":18:32)
    at brand (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:703:17)
    at tryHandleCache (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:274:36)
    at exports.renderFile [as engine] (C:\Users\winne\Documents\wikiwheels\node_modules\ejs\lib\ejs.js:491:10)
    at View.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\view.js:135:8)
    at tryRender (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\application.js:657:10)
    at Function.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\application.js:609:3)
    at ServerResponse.render (C:\Users\winne\Documents\wikiwheels\node_modules\express\lib\response.js:1039:7)
    at getBrand (C:\Users\winne\Documents\wikiwheels\controller\brand.js:23:7)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  path: 'C:\\Users\\winne\\Documents\\wikiwheels\\views\\brand.ejs'
}`

node.js

来源：https://stackoverflow.com/questions/76331078/error-cannot-read-properties-of-null-reading-name-when-using-ejs-with-nodej