JavaScript Learning Notes (ii)

Last Update:2015-04-25 Source: Internet

Author: User

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One, javascript placement, annotation, output tool 1, output tool A, alert (), belongs to the Global function in window. Whatever is written, it is output as a string. B, document.write (); Output content to Web pages.
C, var vlaue=prompt ("Display content", "text box display content") value is the return value; pops up an input box to receive parameters.

 
   
  
  
    
    <script>
  
    
   alert(123);
  
    
   document.write(");
  
    
   var i=prompt("你好","请问你是？");
  
    
   alert(i);
  
    
    </script>

2, JavaScript How to place in HTML page A, <script type= "Text/javascript" language= "JavaScript" ></script> label pair form. Let the browser recognize that JavaScript starts there and ends there. (1)type= "Text/javascript" allows the browser to recognize JavaScript language(2) can be called at any position in head or body
(3) but they are still a whole that are interconnected and interact with each other. As a whole.
b, you can call JavaScript in a hyperlink or redirect (you must start with javascript: "" to wrap it up and let the browser recognize the JavaScript codehyperlink format: "Javascript:alert (' I am a hyperlink ') 'Redirection format: "action=" Javascript:alert (' I am a form ') '

 
   
  
  
    
   <a href="javascript:alert(‘我是超链接‘);">链接</a>//超连接
  
    
    <form action="javascript:alert(‘我是表单‘)" method="post">//重定向
  
    
   <input type="text" name="names"/>
  
    
   <input type="submit" value="提交"/>
  
    
    </form>

C. Call after an event
format: onclick= "Javascript:alert (' I am an event ')"

 
   
  
  
    
   <div onclick="javascript:alert(‘我是事件‘)">我是事件</div>

ie under the special event call, Firefox Google does not support:

 
   
  
  
    
   <script for="one" event="onclick">
  
    
   alert(我是IE特有事件);
  
    
   </script>
  
    
   <body>
  
    
   <div id="one">我是IE特有事件</div>
  
    
   </body>

D. Calling external JavaScript files
* cannot have any code in the call page <script> tag pair
* Tag pairs cannot appear in JS script
* All JS are a whole, are interconnected, affect each other
format: <script src= "file path" ></script>

 
   
  
  
    
   JavaScript files written in
  
    
   var a="你好世界"
  
    
   alert(a);

 
   
  
  
    
   <!--html页面中-->
  
    
   
  
    
   <script src="文件路径"></script>

3. CommentsA, the browser against the long
(1)  as HTML code masking
B. Normal comment
(2)//xxxxxxxx single-line comment
(3)/*xxxxxxxx*/multi-line annotation

From for notes (Wiz)

JavaScript Learning Notes (ii)

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