${name!'默认名'}  或者  ${name?default('默认名')}

逻辑判断

... ...

${age > 18 ? string('成年人','未成年人')}

   序号${person_index} . 姓名:${person.name} / 年龄:${person.age} .

   ${key}  . 姓名:${personMap[key].name} / 年龄:${personMap[key].age}

   姓名:${person.name} / 年龄:${person.age} .

${price?c}

${person.name?if_exists }

${person.birthday?string('yyyy-MM-dd')}

${price?string.number}

${price?string.currency}

${price?string.percent}

${"person" ?cap_first} 

${"person" ?html} 

${"person" ?lower_case} 

${"person" ?trim} 

${name}

${name }