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                ``` onchange屬性會在文件選擇后執行file_select()方法 <span class="btn-upload" > <a href="javascript:void();" class="btn btn-primary radius btn-upload" ><i class="Hui-iconfont">&#xe642;</i> 上傳應用</a> <input type="file" id="file" class="input-file" style="opacity: 0;" onchange="file_select()"> </span> onclick="file_select()"會在選擇文件之前執行file_select()方法 ``` ``` const files = document.getElementById('file').files;可以打印上傳文件的信息 const files = $('#file').files;不能打印 ```
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