Freemarker common syntax

①: Restrict the value of the field to be taken out: from the 0th bit to the 2nd bit.

[0..2]

②: Take out the first 3 pieces of data in the list through _index.

<#if (list_index < 3) >

</#if>

③: Traverse the list.

<#list  studentList as sut>

${stu.name}

</#list>

④: if-else-if statement format.

<#if (condition)>

<#elseif (condition)>

<#else>

</if>

⑤: Introduce the page.

<#include "header.html"/>

⑥: Define variables.

<#assign i = 1/>

⑦: Determine whether it is empty.

student??

⑧: Use "-" instead of empty.

${stu.name!"-"}