vscode debug for chrome

Question

launch.json 的配置如下

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "chrome",
            "request": "launch",
            "name": "LaunchChrome",
            "url": "http://localhost:8088",
            "webRoot": "${workspaceRoot}"
        }
    ]
}

项目目录如下

|-demo
  |-.vscode
    |-launch.json
  |-test.js

在 test.js 中打了断点，点击启动调试按钮，弹出了 chrome，但是一直访问不了 http://localhost:8088/test.js。