JavaScript, implementation of the function of moving the select tag element left and right

Design a piece of code through Javascript to achieve the following functions. The initial interface is as shown below. Select several options in the left label and then click –> to move them to the right frame and the left options disappear. After clicking ====>, all the options on the left will be moved to the right. After clicking on a few options on the right, and then clicking <—, these options will be moved to the left. Click <====, and the options will be moved to the right. All options are moved to the left. The code is as follows:

  
  
  



   
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   " Onclick="add()">

   " Onclick="addall()">

   <input type="butoon" value="

   <input type="butoon" value="



   
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The results are as follows

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