肖龙 Smalladragon
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| # 标识符（Identifier） # | |
| 定义 | |
| Java对程序中的各个元素加以命名时使用的命 | |
| 名记号称为标识符(identifier)。 | |
| 类名、变量名、常量名、方法名、… | |
| 特点 | |
| Java语言中，标识符是以字母、下划线(_)、美 | |
| 元符($)开始的一个字符序列，后面可以跟字母、 |
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| # 计算机基础概论 # | |
| var str = "hello world "; | |
| (2)var str = new String() | |
| # 2.string对象的方法 # | |
| (1)charAr() :返回字符串某一个下标的字符。 | |
| (2)charCodeAt() ：返回字符串指定的位置的字符的 Unicode 编码。 |
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| # 跳转语句 # | |
| break：浏览器执行到break，直接跳出循环或判断语句，结束本语句 | |
| continue：语句的作用是忽略其后的语句并结束此轮循环和开始新的一轮循环Continue与break语句非常类似，但他不是退出循环，而是转而执行下一次循环。return：语句结束函数执行，返回调用函数，而且把表达式的值作为函数的结果 | |
| # 函数的声明方法 # | |
| （1）：使用function关键字 | |
| function a(){ | |
| } | |
| (2):使用变量和匿名函数 |
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| # 关于正则表达式 # | |
| 处理字符串时，有很多较为复杂的字符串用普通的字符串处理函数无法干净的完成。比如说，可能需要验证一个Email地址是否合法，为此需要查看许多不容易检查的规则。这正是正则表达式的用武之地。正则表达式是功能强大而简明的字符组，其中可以包含大量的逻辑，特别值得一提的是正则表达式相当简短。 | |
| # 正则表达式的用处 # | |
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| 获取DOM节点的方法 | |
| 1.获取父节点 parentNode | |
| 2.获取该节点的子节点数组 childNodes | |
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| # DOM 增删 # | |
| 1createElement（）：创建元素节点 | |
| 将需要创建的标签名，放到小括号中。加括号（加引号的是直接找到，不加是间接） | |
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| # BOM 方法 # | |
| 浏览器对象模型（Browser Object Model） | |
| BOM提供了独立于内容而与浏览器窗口进行交互的对象。 | |
| 由于BOM主要用于管理窗口与窗口之间的通讯，因此其核心对象是window. | |
| BOM由一系列相关的对象构成，并且每个对象都提供了很多方法与属性。 |
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| # 什么是javaScript事件？ # | |
| 事件(Event)是JavaScript应用跳动的心脏，也是把所有东西粘在一起的胶水，当我们与浏览器中Web页面进行某些类型的交互时，事件就发生了。 | |
| 事件是文档或浏览器中发生的特定交互瞬间！ | |
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| //获取一下浏览器的信息 | |
| var ff = navigator.userAgent.indexOf("Firefox"); | |
| //第一步：不同的事件添加方式 | |
| if(ff != -1){ //判断是否为火狐浏览器 |