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                            ## 隨機選中下拉框
```
<body>

<input type="button" id="btn" value="設置">

<select name="" id="select">
    <option value="">1</option>
    <option value="">2</option>
    <option value="">3</option>
</select>


<script>
    var btn = document.getElementById('btn');
    btn.onclick = function () {
        var select = document.getElementById('select');
        var options = select.getElementsByTagName('option');
        var random = Math.floor(Math.random() * options.length);
        var option = options[random];
        option.selected = true;
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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