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                            ## 案例
```
<body>
<input type="text" id="txt">
<script>
    var txt = document.getElementById('txt');
    txt.onkeydown = function (e) {
        e = e || window.event;
        //console.log(e.keyCode); 獲取鍵盤的鍵盤碼,是數字
        //48到57是數字
        if ((e.keyCode < 48 || e.keyCode > 57) && e.keyCode != 8) {  //delete 無法刪除
            //非數字
            //取消默認行為
            // return false;
            e.preventDefault();
        }
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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