尝试重新启动VSCode。如果不起作用，请尝试通过以下方式配置任务：
Command palette (Ctrl+Shift+P / F1) > Tasks: Configure default build task
如果这不起作用，这里是默认的任务配置：

{
    "version": "2.0.0",
    "tasks": [
        {  // For build
            "type": "typescript",
            "tsconfig": "tsconfig.json",
            "problemMatcher": [
                "$tsc"
            ],
            "group": "build",
            "label": "tsc: build - tsconfig.json"
        },
        {  // For watch
            "type": "typescript",
            "tsconfig": "tsconfig.json",
            "option": "watch",
            "problemMatcher": [
                "$tsc-watch"
            ],
            "group": "build",
            "label": "tsc: watch - tsconfig.json"
        },
        { // If both of the above don't work you could create an npm script and run it via this task
            "type": "npm",
            "script": "build", // This should be the name of your script
            "problemMatcher": [],
            "label": "npm: build typescript"
        }
    ]
}

要检测到这些，请在工作区的根目录下创建一个.vscode文件夹，并在其中创建一个文件tasks.json。如果您将上面的json放入其中，VSCode将找到您的任务。