Javascript 无法读取属性'；名称'；路由参数中未定义的

紧随其后

我有以下建议（）：

但是如果我转到

http://localhost:3000/name/

错误：无法获取/name/

如果我转到

http://localhost:3000/name/Leon

错误：

TypeError: Cannot read property 'name' of undefined
   at /Users/leongaban/Projects/Node/expressApp/server3.js:5:39
   at Layer.handle [as handle_request] (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/layer.js:82:5)
   at next (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/route.js:100:13)
   at Route.dispatch (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/route.js:81:3)
   at Layer.handle [as handle_request] (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/layer.js:82:5)
   at /Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:235:24
   at param (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:332:14)
   at param (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:348:14)
   at Function.proto.process_params (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:392:3)
   at /Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:229:12

---

不确定我遗漏了什么？

参数

在
req
上。使用
req.params.name

关于无法获取/name/，如果在路由中指定一个参数，将url的该部分留空将与路由不匹配。您必须填充url的
：name
部分才能点击路由。
请求对象包含参数而不是响应。考虑一下您向服务器发出的包含请求参数的请求？所以请求对象持有它们

您需要
req.params.name
如果您使用的是
body parser
您将在
req.query.name
中获得它
body parser
不解析url参数，只解析请求的主体。解析后的正文显示在
req.body
中<代码>请求查询

包含查询字符串中的键值对，位于

？

TypeError: Cannot read property 'name' of undefined
   at /Users/leongaban/Projects/Node/expressApp/server3.js:5:39
   at Layer.handle [as handle_request] (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/layer.js:82:5)
   at next (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/route.js:100:13)
   at Route.dispatch (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/route.js:81:3)
   at Layer.handle [as handle_request] (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/layer.js:82:5)
   at /Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:235:24
   at param (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:332:14)
   at param (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:348:14)
   at Function.proto.process_params (/Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:392:3)
   at /Users/leongaban/Projects/Node/expressApp/node_modules/express/lib/router/index.js:229:12