下面的示例中，alert被写成了aler，因此会报ReferenceError：

    JavaScript 执行错误 - 图1 

    2.     "notifierVersion": "0.2.0",
    3.     "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/20100101 Firefox/54.0",
    4.     "locale": "zh",
    5.     "url": "http://localhost:4000",
    6.     "apiKey": "API-KEY",
    7.     "name": "ReferenceError",
    8.     "time": 1502863944724,
    9.     "message": "Uncaught ReferenceError: aler is not defined",
    11.     "columnNumber": 1,
    12.     "stacktrace": "@http://localhost:4000/test.js:1:1\n",
    13.     "type": "uncaught",
    15. }

    JavaScript执行错误的type属性值分为caught或者uncaught两种，caught为发送的错误，而uncaught为Fundebug插件自动捕获的错误。