thymeleaf使用自定義組件

分兩步：

• 爲組件命名
• 調用組件

具體實施：

• th:fragment="main"
• <div th:insert="~{commons :: main}">...</div>

例子：

<!--頂部狀態欄-->
<nav class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0" th:fragment="headbar">
    <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">[[ ${session.username} ]]</a>
    <input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search">
    <ul class="navbar-nav px-3">
        <li class="nav-item text-nowrap">
            <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Sign out</a>
        </li>
    </ul>
</nav>

<div th:insert="~{commons/commons::headbar}"></div>