本书介绍Javascr ipt的基础使用方法，全书12涨，首先使读者了解基本要素，接着逐渐深入到语言的基本结构，然后学习更高级的话题，最终创建真正功能强大的web页面-This book introduces the basic use of Javascr ipt, book 12 up, so that readers understand the basic elements first, then gradually penetrated into the basic structure