JQuery介绍概述
JQuery是什么？ JQuery有什么特点？1.JQuery是什么？
jquery是一个JavaScript（JS）框架，它支持JS的常规操作以及一些扩展，比如图形等，对JSON格式也能很好的解析，ajax也做了封装，语法也比较简单。很强大。
但不好的是它将js语法与开发人员完全隔离，也就说你开发几年jquery后还会不会用纯js都是个问题。
我认识一些朋友，他们完全用Jquery开发，一些特效效果不费吹灰之力就出来了，但如果抛弃jqery框架，估计最简单的JS代码都看不懂。2.JQuery有什么特点？
1.提供了强大的功能函数使用这些功能函数, 能够帮助我们快速完成各种功能, 而且会让我们的代码异常简洁.2.解决浏览器兼容性问题javascript脚本在不同浏览器的兼容性一直是Web开发人员的噩梦,常常一个页面在IE7,Firefox下运行正常, 在IE6下就出现莫名其妙的问题. 针对不同的浏览器编写不同的脚本是一件痛苦的事情. 有了jQuery我们将从这个噩梦中醒来, 比如在jQuery中的Event事件对象已经被格式化成所有浏览器通用的, 从前要根据event获取事件触发者, 在ie下是event.srcElements 而ff等标准浏览器下下是event.target. jQuery则通过统一event对象,让我们可以在所有浏览器中使用event.target获取事件对象.3.实现丰富的UIjQuery可以实现比如渐变弹出, 图层移动等动画效果, 让我们获得更好的用户体验. 单以渐变效果为例, 从前我自己写了一个可以兼容ie和ff的渐变动画, 使用大量javascript代码实现, 费心费力不说, 写完后没有太多帮助过一段时间就忘记了. 再开发类似的功能还要再次费心费力. 如今使用jQuery就可以帮助我们快速完成此类应用.4.纠正错误的脚本知识这一条是我提出的, 原因就是大部分开发人员对于javascript存在错误的认识. 比如在页面中编写加载时即执行的操作DOM的语句, 在HTML元素或者document对象上直接添加"onclick"属性,不知道onclick其实是一个匿名函数等等.拥有这些错误脚本知识的技术人员也能完成所有的开发工作, 但是这样的程序是不健壮的. 比如"在页面中编写加载时即执行的操作DOM的语句", 当页面代码很小用户加载很快时没有问题, 当页面加载稍慢时就会出现浏览器"终止操作"的错误.jQuery提供了很多简便的方法帮助我们解决这些问题, 一旦使用jQuery你就将纠正这些错误的知识--因为我们都是用标准的正确的jQuery脚本编写方法!
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