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                            ## 第一種
```
<body>
<input type="button" id="btn" value="點擊">
<script>
    var btn = document.getElementById('btn');
    btn.onclick = function () {
         alert('hello');
        //移除事件
         btn.onclick = null;
     }
</script>
```

## 第二種
```
<body>
<input type="button" id="btn" value="點擊">
<script>
    var btn = document.getElementById('btn');

    //移除事件. 如果想要移除事件,注冊事件的時候不能使用匿名函數
    function btnClick() {
        alert('hello');
        btn.removeEventListener('click', btnClick);
    }

    btn.addEventListener('click', btnClick);
</script>
```

##  第三種
```
<body>
<input type="button" id="btn" value="點擊">
<script>
    var btn = document.getElementById('btn');

    function btnClick() {
        alert('hello');
        btn.detachEvent('click', btnClick);
    }
    btn.attachEvent('click', btnClick);
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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