1.input标签接收文件类型设置

<input type="file" accept="image/*">

<input type="file" accept="image/gif,image/jpeg,image/jpg,image/png,image/svg">

--------------只接收图片

<input type="file" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel">

或者:

accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

---------------只接收excel表格