问为什么由APEX可调度类发送HTML电子邮件时使用的是空白体？

EN

global class ReportBroadcaster implements Schedulable {

    global ReportBroadcaster() {
    }

    global void execute(SchedulableContext sc) {
      send();
    }

    global void send() {
      PageReference page = new PageReference('/apex/nameofvfpage');
      page.setRedirect(true);
      Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
      email.setSubject('Example Subject');
      email.setHtmlBody(page.getContent().toString());
      email.setToAddresses(new String[]{'test@test.com'});
      Messaging.sendEmail(new Messaging.SingleEmailMessage[]{email});     
    }
}