DocumentRenderer打印对象类型的文档。文本属性,包括　　字体,颜色和小图标,将被提交给一个打印页。　　DocumentRenderer换行符、paginates计算,并执行其他　　格式化。-DocumentRenderer prints objects of type Document. Text attributes, including

　　fonts, color, and small icons, will be rendered to a printed page.

　　DocumentRenderer computes line breaks, paginates, and performs other

　　formatting.