书名：学习JavaScript（第二版，影印版）

作者：Shelley Powers 著

国内出版社：东南大学出版社

出版时间：2009年07月

页数：375

书号：978-7-5641-1649-1

原版书出版商：O'Reilly Media

 

Shelley Powers从JavaScript初次开发到现在最新的图形和设计工具发布，Shelley Powers已经从事Web技术工作和写作达15年之久。她最近在O’Reilly出版的图书包括语义网、Ajax、JavaScript和Web图形。她是一位热情的业余摄影师，也是Web开发的狂热爱好者，她从JavaScript刚发布时，就开始使用和编写Web技术相关书籍。她之前在O’Reilly出版了8本书，包括Developing ASP Components（2001），Adding Ajax（2007）和JavaScript Cookbook（2010）。

 

 

The animal on the cover of Learning JavaScript, Second Edition, is a baby black, or
hook-lipped, rhinoceros (Diceros bicornis). The black rhino is one of two African species
of rhinos. Weighing up to one and a half tons, it is smaller than its counterpart—
the white, or square-lipped, rhinoceros. Black rhinos live in savanna grasslands, open
woodlands, and mountain forests in a few small areas of southwestern, south central,
and eastern Africa. They prefer to live alone and will aggressively defend their territory.
With an upper lip that tapers to a hooklike point, the black rhino is perfectly suited to
pluck leaves, twigs, and buds from trees and bushes. It is able to eat coarser vegetation
than other herbivores.
Black rhinos are odd-toed ungulates, meaning they have three toes on each foot. They
have thick, gray, hairless hides. Among the most distinctive of the rhino’s features is
its two horns, which are actually made of thickly matted hair rather than bone. The
rhino uses its horns to defend itself against lions, tigers, and hyenas, or to claim a female
mate. The courtship ritual is often violent, and the horns can inflict severe wounds.
After mating, the female and male rhinos have no further contact. The gestation period
is 14 to 18 months, and the calves nurse for a year, though they are able to eat vegetation
almost immediately after birth. The bond between a mother and her calf can last up to
four years before the calf leaves its home.
In recent years, rhinos have been hunted to the point of near extinction. Scientists
estimate that there may have been as many as a million black rhinos in Africa 100 years
ago, a number that has dwindled to 2,400 today. All five remaining species, which
include the Indian, Javan, and Sumatran rhinos, are now endangered. Humans are
considered their biggest predators.