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                            ## 頁面加載事件 (onload)
頁面是至上往下執行的,onload是頁面加載完成事件.頁面加載完成,頁面上所有的元素創建完畢,并且引用的外部資源下載完畢(js,css,圖片).這樣我們就可以把JS代碼寫在head里面了.

```
    <script>
        window.onload = function () {
            var box = document.getElementById('box');
            console.dir(box);
        }
    </script>
</head>
<body>

<div id="box">

</div>
</body>
```

## onunload
頁面卸載的時候執行.在onunload中所有的對話框都無法使用window對象被凍結. 可以在卸載頁面的時候清空購物車.
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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