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                            ##  綁定多個事件
第二次綁定的事件會把第一次綁定的事件覆蓋掉.
```
<body>
<input type="button" id="btn" value="點擊">
<script>
    var btn = document.getElementById('btn');
    btn.onclick = function () {
        alert('1');
    }

    btn.onclick = function () {
        alert('2');
    }
</script>
```

## 注冊多個事件
```
<body>
<input type="button" id="btn" value="點擊">
<script>
    var btn = document.getElementById('btn');
    btn.addEventListener('click',function () {
        alert('1');
    });

    btn.addEventListener('click',function () {
        alert('2');
    });
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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