赋值
<#assgin str=“23”>
取值
${str} //输出23
获取字符串长度
${str?length} //输出2
转换为数值类型
${str?number}
遍历数字
<#list 1…str?number as i>
${i} //输出1-23
</#list>
倒序遍历?reverse
<#list 1…str?number?reverse as i>
${i} //输出23-1
</#list>
获取list长度
<#assign list=[0,1,2,3,4,5] />
${list?size} //输出6