javascript - jscript dropdown menu doesn't work on other buttons -

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im creating navigation bar using button dropmenu. 1 button functions (abou button). clicking other button (blog) displays same dropmenu though put different menu it. here's code. thank help.

javascript:

function myfunction(){     document.getelementbyid("mydropdown").classlist.toggle("show"); }  window.onclick = function(event){     if(!event.target.matches('.dropbtn')){         var dropdowns = document.getelementsbyclassname("dropdown-content");         var i;          for(i = 0; < dropdowns.length; i++){             var opendropdown = dropdowns[i];             if(opendropdown.classlist.contains('show')){                 opendropdown.classlist.remove('show');             }         }     } }

html:

<div class="dropdown">     <button onclick="myfunction()" class="dropbtn"> <img src="images/whitearrow.png" width="10" height="10" ></button>     <div id="mydropdown" class="dropdown-content">         <a href="site_profile.php">company profile</a>         <a href="management.php">management</a>         <a href="testimonials.php">testimonials</a>         <a href="services.php">services </a>     </div> </div>        <div class="dropdown">       <span><button onclick="myfunction()" class="dropbtn" >blog <img src="images/whitearrow.png" width="10" height="10" ></button></span>     <div id="mydropdown" class="dropdown-content">         <a href="#">tips</a>         <a href="#">success story</a>         <a href="#">featured employee</a>         <a href="#">events </a>     </div> </div>


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