freemarker，数字，日期，布尔值常用的函数

${3.4?floor}
${3.4?ceiling}
${3.45?round}
${3.45?rtf}
${3.458?string("0.##")}
${3.42?string.percent}
${3.42?string.currency}
${date?string("yyyy-MM-dd")}
${date?date}
${date?time}
${date?datetime}

${true?c}
${true?string}
${true?string("yes","no")}