JSP combining JS to implement the method of SRC update request in IMG _jsp programming

The example of this article describes the JSP combined with JS to implement the SRC update request in IMG method. Share to everyone for your reference. Specifically as follows:

1.javascript (Updated function)

<script type= "Text/javascript" > 
function Changeimage () { 
  var img = document.getElementById ("Imgvcode") ;
  if (img.name = = 1) { 
    img.name = 2; 
    IMG.SRC = "Shop.do?method=registerimage2";
  } else if (Img.name = 2) { 
    img.name = 1; 
    IMG.SRC = "Shop.do?method=registerimage";
  } 
} 
</script>

2.jsp img and IMG changed code

<td> 
  
  < Input name= "code" type= "text" id= "Txtverifycode" class= "Yzm_input" onblur= "Testcode" 
    (this)/>
  class= "Text_left T1" >
    <p class= "T1" >
      <span id= "vcodevalidmsg" > Please enter four letters in the picture. </span> 
      <span id= "Codeinfo" style= "color:red" ></span> 
      <a href= "#" id= "Imgchange" Onclick= "Changeimage ()" > Can't see clearly? Change a picture </a>
    </p> 
  </div> 
</td>

3. Background Action Code

Public Actionforward registerimage (actionmapping mapping, actionform form, 
   httpservletrequest request, HttpServletResponse response)
    throws Exception { 
    //Create image, return authentication code 
    response.setcontenttype ("Image/jpeg "); 
    OutputStream out = Response.getoutputstream (); 
    String strensure = Shopmanager.createimageinfo (50,20,out);
    Set to session 
    Request.getsession (). setattribute ("Strensure", strensure);
    return null; 
  } 
  Public Actionforward RegisterImage2 (actionmapping mapping, actionform form, 
      httpservletrequest request, HttpServletResponse response)
      throws Exception { 
    //Create image, return authentication code 
    response.setcontenttype ("image/ JPEG "); 
    OutputStream out = Response.getoutputstream (); 
    String strensure = Shopmanager.createimageinfo (50,20,out);
    Set to session 
    Request.getsession (). setattribute ("Strensure", strensure);
    return null; 
} 

I hope this article will help you with your JavaScript programming.