回答

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>BFW NEW PAGE</title>

    <script id="bfwone" data="dep=vue.2.2.min|axios.min|qs.min&err=0" type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/bfwone.js"></script>
    <script type="text/javascript">
        bready(function() {
            var app = new Vue({
                el: '#app',
                data: {
                    isshow: true
                },
                methods: {
                    uploadfile: function(e) {
                        var that = this;

                        var formData = new window.FormData() // vue 中使用

                        formData.append('filedata', document.querySelector('#choosefile').files[0])
                        var options = {
                            // 设置axios的参数
                            url: '后端上传程序地址',
                            data: formData,
                            method: 'post',
                            headers: {
                                'Content-Type': 'multipart/form-data',

                            }
                        }
                        axios(options).then((res) => {
                            console.log(res);
                        }); // 发送请求
                    }
                }

            });
        });
    </script>
    <style>
    </style>
</head>
<body>
    <div id="app">
        <input type="file" @change="uploadfile" id="choosefile" value="" />
    </div>
</body>
</html>