材質 UI 列表組件不顯示

Question

我想為移動視圖顯示一個 Material UI 列表作為我的下拉菜單（一個 Material UI 抽屜組件）的一部分，但由於某種原因，實際列表沒有顯示。

該列表的代碼如下所示：

const menuItems = [
    {
       text: 'Home',
       path: '/'
    },
    {
       text: 'About',
       path: '/about'
    }
];

...

<List>
    {menuItems.map(item => (
        <ListItem
             button
             key={item.text}
             onClick={() => history.push(item.path)}
        >
             <ListItemText>{item.text}</ListItemText>
        </ListItem>
    ))}
</List>

這是應該顯示我的列表項的結果，但我得到了這個奇怪的圖標：

這是我的 package.json 文件：

{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@material-ui/core": "^4.12.1",
    "@material-ui/icons": "^4.11.2",
    "@material-ui/styles": "^4.11.4",
    "@testing-library/jest-dom": "^5.11.4",
    "@testing-library/react": "^11.1.0",
    "@testing-library/user-event": "^12.1.10",
    "firebase": "^8.7.1",
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-router": "^5.2.0",
    "react-router-dom": "^5.2.0",
    "react-scripts": "4.0.3",
    "react-timeago": "^6.2.1",
    "web-vitals": "^1.0.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

——

編輯：

這是一個有效的 CodeSandbox 示例

Answer 1

錯誤在於導入。

正確的：

import List from "@material-ui/core/List";

Answer 2

您從"@material-ui/icons/List"導入了List 。 您應該刪除它並從"@material-ui/core"導入List ：

import { List } from "@material-ui/core";

這是可執行和正確的示例： https : //codesandbox.io/s/floral-snowflake-ub04r