Javascr ipt是一种由Netscape的Livescr ipt发展而来的原型化继承的面向对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。当时服务端需要对数据进行验证，由于网络速度相当缓慢，只有28.8kbps，验证步骤浪费的时间太多。于是Netscape的浏览器Navigator加入了Javascr ipt，提供了数据验证的基本功能-Javascr ipt is client-side scr ipting language is a dynamic type of Livescr ipt by Netscape prototype evolved object-oriented inheritance case-sensitive, the main purpose is to solve the server-side language, such as Perl, the legacy of the speed problems for customers provide a smoother browsing experience. At that time the server needs to validate the data, due to the relatively slow speed of the network, only too 28.8kbps, verification steps wasted time. So Netscape Navigator browser joined Javascr ipt, provides the basic functions of data validation