三．常用语法 EG.一个对象BOOK

1.输出 ${book.name}

空值判断：${book.name?if_exists },

${book.name?default(‘xxx’)}//默认值xxx ${ book.name!"xxx"}//默认值xxx

日期格式：${book.date?string('yyyy-MM-dd')}

数字格式：${book?string.number}--20 ${book?string.currency}--<#-- $20.00 --> ${book?string.percent}—<#-- 20% -->

插入布尔值： <#assign foo=ture /> ${foo?string("yes","no")} <#-- yes -->

2．逻辑判断 a: <#if condition>... <#elseif condition2>... <#elseif condition3>...... <#else>... 其中空值判断可以写成<#if book.name?? >

</#if>

b: <#switch value> <#case refValue1> ... <#break> <#case refValue2> ... <#break> ... <#case refValueN> ... <#break> <#default> ... </#switch>

3．循环读取 <#list sequence as item> ... </#list> 空值判断<#if bookList?size = 0></#list>

e.g. <#list employees as e> ${e_index}. ${e.name} </#list> 输出:

1. Readonly
2. Robbin