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                            ### 代碼：
~~~
<body>
   <div action="">
        <h3>選擇愛好</h3>
        <input type="checkbox">籃球
        <input type="checkbox">足球
        <input type="checkbox">橄欖球
        <input type="checkbox">棒球<br>
       <button id="all">全選</button>
       <button id="no">全不選</button>
       <button id="reverse">反選</button>
   </div> 
   <script>
   var all=document.getElementById("all")
   var no=document.getElementById("no")
   var reverse=document.getElementById("reverse")
   var checkbox=document.getElementsByTagName("input")
   all.onclick=function(){
       for(let i=0;i<checkbox.length;i++){
           checkbox[i].checked=true;
       }
   }
   no.onclick=function(){
       for(let i=0;i<checkbox.length;i++){
           checkbox[i].checked=false;
       }
   }
   reverse.onclick=function(){
       for(let i=0;i<checkbox.length;i++){
         checkbox[i].checked=(checkbox[i].checked==true)?false:true;
        //    checkbox[i].checked=!checkbox[i].checked;
       }
   }
   </script>
</body>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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