thymeleaf：局部变量 th:with

局部变量,th:with能定义局部变量:

<div th:with="firstPer=${persons[0]}">
  <p>
    The name of the first person is <span th:text="${firstPer.name}">Julius Caesar</span>.
  </p>
</div>

当th:with被处理,firstPer变量创建一个局部变量和变量添加到map自上下文,

以便它是用于评估和其他上下文中声明的变量从开始,但只有包含< div >标记的范围内。

div th:with="firstPer=${persons[0]},secondPer=${persons[1]}">
  <p>
    The name of the first person is <span th:text="${firstPer.name}">Julius Caesar</span>.
  </p>
  <p>
    But the name of the second person is 
    <span th:text="${secondPer.name}">Marcus Antonius</span>.
  </p>
</div>

th:width属性允许重用变量定义在相同的属性:

<div th:with="company=${user.company + ' Co.'},account=${accounts[company]}">...</div>

例子：

<div th:switch="${user.role}">
  <p th:case="'admin'">User is an administrator</p>
  <p th:case="#{roles.manager}">User is a manager</p>
</div>

 默认属性default可以用*表示：

<div th:switch="${user.role}">
  <p th:case="'admin'">User is an administrator</p>
  <p th:case="#{roles.manager}">User is a manager</p>
  <p th:case="*">User is some other thing</p>
</div>