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                            ## UserAgent(用戶代理)
前端獲取瀏覽器代理,然后傳給后端.后端根據用戶代理返回不同的內容.
```
<body>
<input type="button" id="btn" value="顯示">
<script>
    var btn = document.getElementById('btn');
    btn.onclick = function () {
        console.log(navigator.userAgent);
    }
</script>
</body>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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