大型系统开发，CSS,JAVAscr ipt,缓存，架构-As applications on the Web become larger and larger, how can web developers manage

the complexity? In many ways, we need to turn to some of the same good practices

used in other types of software development. Generally speaking, these practices are

not yet pervasive in web development—that is, in software development primarily us-

ing HTML, CSS, Javascr ipt, and various server-side scr ipting languages (we’ll use PHP

for the server-side scr ipting in this book, but the same principles apply to many other

languages). Furthermore, the uniqueness of these technologies poses a challenge for

developers trying to apply good practices in a cohesive way.