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Part 2 Quick Start - JS Basics Practical BOM - Browser Object Model, DOM

php是最好的语言
php是最好的语言Original
2018-07-28 10:41:291206browse


#BOM: Encapsulate the browser window into an object model for js to access. The most important object is: window

<!DOCTYPE html>
<html>
    <head>
        <title>BOM--浏览器对象模型</title>
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="this is my page">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <script type="text/javascript">
            function resizeWindow(){
                window.resizeTo(500, 300)
            }
        </script>
        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
    </head>
    <body>
        <pre class="brush:php;toolbar:false">
  BOM:把浏览器窗口封装成对象模型，供js进行访问。最重要的一个对象是:window

window中的属性演示



前进


Two timers:

One-time timer: setTimeout(), clearTimeout()

Periodic timer; setInterval(), clearInterval()

<!DOCTYPE html>
<html>
    <head>
        <title>BOM--浏览器对象模型</title>
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="this is my page">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
    </head>
    <body>
        <h3>window中的方法演示</h3>
        <script type="text/javascript">
            function fun1(){
                window.close();//关闭窗口
            }
            
            function fun2(){
                var boo = window.confirm("是否真的要做某事?");//消息确认
                if (boo) {
                    alert("做某事....");
                }
                else {
                    alert("不做某事....");
                }
            }
            
            
            function fun3(){
                window.moveBy(10, 10);//经测试，当前浏览器，不支持
            }
        </script>
        <input type="button" value="window对象中的close()方法演示" onclick="fun1();">
        <br/>
        <input type="button" value="window对象中的confirm()方法演示" onclick="fun2();">
        <br/>
        <input type="button" value="window对象中的moveBy()方法演示" onclick="fun3();">
        <br/>
        <br/>
        <br/>
        <!--///////////////以下演示定时器////////////////// -->
        <!--这个定时器是一次性的，setTimeout(),clearTimeout()-->
        <input type="button" value="启动定时器1" onclick="start1();">
        <br/>
        <input type="button" value="关闭定时器1" onclick="stop1();">
        <br/>
        <script type="text/javascript">
            var t1;//全局变量
            function start1(){
                t1 = window.setTimeout("aa()", 1000);//返回值为当前闭定时器的id
            }
            
            function aa(){
                alert("aaa.....");
            }
            
            function stop1(){
                t1 = window.clearTimeout(t1);//指定所关闭定时器的id
            }
        </script>
		
		 <!--这个定时器是周期性的，setInterval(),clearInterval()-->
    <input type="button" value="启动定时器2" onclick="start2();"> <br/>
    <input type="button" value="关闭定时器2" onclick="stop2();"> <br/>
	<script type="text/javascript">
	    var t2;
			function start2(){
				//t2=window.setInterval("bb()",2000);
				t2=setInterval("bb()",2000);//返回值为当前闭定时器的id
			}
	 	function bb(){
			//window.alert("bbbbbbb.....");
			alert("bbbbbbb.....");
		}
		
		function stop2(){
			//window.clearInterval(t2); //指定所关闭定时器的id
			clearInterval(t2); //指定所关闭定时器的id
		}
    </script>
	<hr/>
	<!--打开新窗口: open() -->
	 <input type="button" value="新开一个窗口" onclick="demo();"> <br/>
	<script type="text/javascript">
		function demo(){
			//window.open(URL,name,features,replace)
			window.open("ad.html","ad","height=300,width=300,status=no,location=no");
		}
	
	</script>
	
	<input type="button" onclick="disp_prompt()" value="Display a prompt box" /> <br/>

	<script type="text/javascript">
		   function disp_prompt(){
			  var name=prompt("Please enter your name","")
			  if (name!=null && name!="")
			    {
			    document.write("Hello " + name + "!")
			    }
		   }
			 
     </script>


	<input type="button" onclick="disp_scrollBy()" value="Display scrollBy" /> <br/>
	<script type="text/javascript">
		   function disp_scrollBy(){
		   	   scrollBy(10, 10);//模拟用户点击滚动条动作
		   }
     </script>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
	<h2>为了演示滚动效果</h2>
    </body>
</html>

Small example 

<!DOCTYPE html>
<html>
  <head>
    <title>ad.html</title>
	
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
   <h2>一条广告消息</h2>
		<h2>一条广告消息</h2>
		<h2>一条广告消息</h2>
		<form>
		   Name:<input type="text" name="name">
		   <input type="submit" value="注册">
		</form>
		
		<script type="text/javascript">
			//3秒后自动关闭窗口
			setTimeout("window.close();",3000);
		</script>
  </body>
</html>
<!DOCTYPE html>
<html>
  <head>
  	<meta http-equiv="Content-Type"  content="text/html; charset=UTF-8">
    <title>BOM---浏览器对象模型</title>
	<script>
		function resizeWindow()
  	{
 		 window.resizeTo(500,300)
  	}
	</script>

  </head>
  
  <body>
   <h3>history演示中的第二个页面</h3>
   <script>
   	 function fun1(){
	 	//"window."可以省略
		//window.history.back(); //go(-1)
	  	history.back();//go(-1)
	  }
	
   </script>
   
   <a href="#" onclick="fun1 ();">后退</a>
  </body>
</html>

DOM --Document Object Model

Document Object Model (DOM: Document Object Model):

Document: Markup document (HTML, XML). Features: In addition to tags, it is the content encapsulated by tags

Object: an entity that encapsulates attributes and behaviors and can be called directly.

Model: A reflection of some common characteristics that all tagged documents share.

DOM = BOM (Browser Object Model) DOM (Document Object Model)

DHTML: Dynamic HTML, it is not a language, it is the abbreviation of a multiple technology complex. DHTML = HTML CSS DOM JS
Technical boundary:

HTML: Responsible for providing tags and encapsulating data, in order to facilitate the operation of the data in the tags.

CSS: Responsible for providing style attributes and defining the style of the data in the tag.

DOM: Responsible for encapsulating tagged documents and all content in the documents into objects and parsing them. More properties and behaviors are defined in the object to facilitate operations on the object.

JS: Responsible for providing programming language. --if, for, var, function, ...

<!DOCTYPE html>
<html>
    <head>
        <title>DOM--文档对象模型</title>
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="this is my page">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   
        </script>
        <style type="text/css">
            .d {
                background-color: #00ff00;
                width: 200px;
                height: 40px;
            }
        </style>
    </head>
    <body>
        <pre class="brush:php;toolbar:false">
  文档对象模型(DOM: Document Object Model):
  文档:标记型文档(HTML,XML)。特征:里面除了标签，就是标签封装的内容
  对象:封装了属性和行为的实体，可以被直接调用。
  模型:所有标记型文档都具备一些共有特征的一个体现。 
  
  DOM = BOM(浏览器对象模型) + DOM(文档对象模型)

  DHTML：动态HTML，它不是一门语言，是多项技术综合体的简称。
  DHTML = HTML + CSS + DOM + JS
  技术边界:
  HTML: 负责提供标签，对数据进行封装，目的是便于对该标签中的数据进行操作。
  CSS: 负责提供样式属性，对标签中的数据进行样式的定义。
  DOM: 负责将标记型文档以及文档中的所有内容进行封装成对象，解析。
               在对象中定义了更多的属性和行为，便于对对象进行操作。
  JS: 负责提供程序设计语言。--if, for, var , function, ...

Related articles:

Part 1 Quick Start—Date, Math, and Global Objects in Basic JS Practice

Part 3 Quick Start—JS Basic Practical Application Code Sharing

Related videos:

27 classics for front-end JS development Practical video tutorial-free online video tutorial

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