ppwjs之bootstrap文字排版：排版常量

$bootstrap.字體.加粗類 = "font-weight-bold";
$bootstrap.字體.普通類 = "font-weight-normal";
$bootstrap.字體.纖細類 = "font-weight-light";
$bootstrap.字體.斜體類 = "font-italic";
$bootstrap.字體.突出類 = "lead";
$bootstrap.字體.縮小類 = "small";

$bootstrap.對齊方式.左對齊類 = "text-left";
$bootstrap.對齊方式.居中對齊類 = "text-center";
$bootstrap.對齊方式.右對齊類 = "text-right";
$bootstrap.對齊方式.兩端對齊類 = "text-justify";
$bootstrap.對齊方式.不換行類 = "text-nowrap";

$bootstrap.格式.小寫類 = "text-lowercase";
$bootstrap.格式.大寫類 = "text-uppercase";
$bootstrap.格式.首字母大寫類 = "text-capitalize";
$bootstrap.小型大寫縮略詞類 = "initialism";