ASP.NET Core 2.1以上 Bootstrap 4前端模板文件，开发环境与发布环境前端模板 environment的使用

    <environment include="Development">
        <link rel="stylesheet" href="~/bootstrap4/css/bootstrap.css" />
        <link rel="stylesheet" href="~/FontAwesome/css/font-awesome.css" />
        <link rel="stylesheet" href="~/css/site.css" />
    </environment>

    <environment exclude="Development">
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
              asp-fallback-href="~/bootstrap4/css/bootstrap.min.css"
              asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute"
              integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous" />
        <link rel="stylesheet" href="~/FontAwesome/css/font-awesome.min.css" />
        <link rel="stylesheet" href="~/css/site.min.css" asp-append-version="true" />
    </environment>

  <environment include="Development">
        <script src="~/lib/jquery/dist/jquery.js"></script>
        <script src="~/bootstrap4/js/bootstrap.js"></script>
        <script src="~/bootstrap4/js/bootstrap.bundle.js"></script>
        <script src="~/js/site.js" asp-append-version="true"></script>
    </environment>
    <environment exclude="Development">
        <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"
                asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
                asp-fallback-test="window.jQuery"
                crossorigin="anonymous"
                integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT">
        </script>
        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
                asp-fallback-src="~/bootstrap4/js/bootstrap.min.js"
                asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal"
                crossorigin="anonymous"
                integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy">
        </script>
        <script src="~/bootstrap4/js/bootstrap.bundle.min.js"></script>
        <script src="~/js/site.min.js" asp-append-version="true"></script>
    </environment>