1. 查找转移

<#function getSubSlot x >
  <#return (x) ? switch( 
    "1", "L",
    "2", "R",
    ""
  )>
</#function>

2. 转换数字 

?number

${mergedMap[placement.sequence].material.subslot?number-1}

3. 截取字符串

substring方法的表达式为?substring(from, to)

4. 时间格式转换

<timestamp value="${head.time?datetime("yyyyMMddHHmmss.SSS")?string('dd/MM/yyyy hh:mm:ss')}" />

5. 判断变量是否在结构体中存在

<#if (partsMap?size > 0) && (!partsMap[position.partId]?exists)>

6. 数组中加变量

<#assign myArray = [] />

<#assign myArray += ["element2"] />

7. 跳过List循环

<#list listOfNumbers as num>
    <#if num == 3>
        <#continue>
    </#if>
    Number: ${num}<#if num != listOfNumbers?last>, </#if>
</#list>