javascript知识点

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时间：2017-12-30

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1、JavaScript知识点第一章、JavaScript的基本语法回顾HTML标签：HTML文档标签HTML文档的头部HTML文档的标题<BODY>定义文档的内容<FONT>定义文字的字体、字号、属性<P>定义文本的段落<BR>文本的换行<IMG>插入图片<HR>插入水平线<A>定义超链接<MARQUEE>实现页面中的滚动文字或图片表格：<TABLE>定义表格<TR>定义行<TD>定义行里面的列ROWSPAN跨的行数COLSPAN跨的列数表单：<FORM>定义表单标签action</p><p>2、设置提交的处理位置method设置传输方式表单元素：文本框（text）、密码框（password）、单选按钮（radio）、复选框（checkbox）、列表框（<select>和<option>）、按钮（普通按钮（button）、提交按钮（submit）、重置按钮（reset））、多行文本框（<textarea>）样式表：主要是CSS样式表。”.a”这样命名的必须引用样式;”a”这样命名的将自动适用于所有a标签JavaScript解决的问题表单验证、页面动态效果主要有这两大方面、以及为后面的技术打下基础javaSc</p><p>3、ript是一门脚本语言基本结构如下：returncheckForm()<SCRIPTlanguage=”JavaScript”><!-JavaScript语句--></SCRIPT>脚本执行原理浏览器接收用户的请求，然后向服务器把用户需要的请求消息发送到应用服务器端，等等服务器端响应，应用服务器端向浏览器发出响应消息，即把用户需要的页面发送到浏览器端，然后由浏览器从上至下逐条解析HTML标签和JavaScript脚本，并显示页面效果呈现给用户好处：1、含脚本的页面只要下载一次即可，这样能减少不必要的网络通信2、脚本</p><p>4、程序是由浏览器客户端执行，而不是由服务器端执行，因此能减轻服务器端的压力JavaScript的基本语法变量的声明和赋值var合法的变量名；运算符号算术运算符：包括+、-、*、/、％、++、--、-（求反）比较运算符：包括<、>、<=、>=、==、!=逻辑运算符：包括！、&&、</p><p>5、</p><p>6、赋值运算符：包括＝及其扩展赋值运算符逻辑控制语句(主要有条件语句、循环语句、switch语句)条件语句if(表达式)｛JavaScript语句1；｝Else｛JavaScript语句2；｝循环语句For(初始化；条件；增量或减时){Java</p><p>7、Script语句；}While(条件){JavaScript语句；}switch语句switch(表达式){Case常量值1：JavaScript语句1；bread;Case常量值2：JavaScript语句2；bread;Case常量值3：JavaScript语句3；bread;……Default：JavaScript语句4；bread;}注释单行注释以//开头，行末结束多行注释以/*开头，*/结束类型转换parseInt()转换成整数和parseFloat()转换为浮点数这两个方法JavaScript的高级语法</p><p>8、－自定义函数function创建函数Function函数名（参数1，参数2，参数3…..）｛语句;｝函数的定义放在<SCRIPT>与</SCRIPT>之间调用函数事件名＝“函数名（’参数1’，’参数2’，’参数3’…..）”;常见错误JavaScript中是区分大小写的如果是进行计算的，注意计算前要进行类型转换，第二章、DOM编程-window对象DOM模型介绍概念：HTML文档对象模型（HTMLDOM）定义了一套标准方法来访问和操纵HTML文档。DOM（documentobjectmodel）由万维网联盟（wor</p><p style="height:0px;padding:0;margin:0;overflow:hidden">9、ldwidewebconsortium,W3C）定义HTML文档的树状结构HTML的所有对象都是节点，每个对象就是一个节点，每个节点都有属性、方法、事件。最大的根节点就是文档（document）Window对象常用的属性、方法、事件介绍常用属性：status指定浏览器状态栏中显示的临时消息Screen有关客户端的屏幕和显示性能的信息History有关客户访问过的URL的信息Location有关当前URL的信息Document表示浏览器窗口中的HTML文档常用方法：alert(“提示信息”)显示一个带有提示住处和确定</p><p style="height:0px;padding:0;margin:0;overflow:hidden">10、按钮的对话框Confirm(“提示信息”)显示一个带有提示信息，确定和取消按钮的对话框Open(“url”,”name”)打开具有指定名称的新窗口，并加载结定的URL所指定的文档，如果没有提供，则打开一个空白文档。Close()关闭当前窗口showModalDialog(“url”,”name”)在一个模式窗口中显示指定的HTML文档常用事件：了解了wind</p> </div> <div class="mt-3 bg-white"> <div class="d-lg-block d-none px-3 px-lg-4 py-3 border-bottom text-center font-18"> 当前文档最多预览五页，下载文档查看全文 </div> <div class="detail-fixed-feature d-none d-lg-block" id="detailFixedFeatureBox"> <div class="px-3 px-lg-4 py-3 d-flex align-items-center justify-content-between fixed-feature-box" id="detailFixedFeature"> <div class="d-lg-flex d-none align-items-center"> <div> <a class="btn 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