<li class="scroll-item first-item" @click="chooseImage">

    <i class="iconPhoto"></i>

    <span class="title">拍照</span>

    <input @change="photoChange($event)" type="file" id="upload_file" multiple style="display: none"/>

</li>

 　　　　　　chooseImage(){

              document.getElementById('upload_file').click(); //触发input-file文件上传控件 事件photoChange

 　　　　　　},

            photoChange(el) {

                var file = el.target.files[0];//name: "dangqi1.png" || type: "image/png"

                var type = file.type.split('/')[0];

                if ( type === 'image' ){

                    //将图片img转化为base64

                    var reader = new FileReader();

                    reader.readAsDataURL(file);

                    var that = this;

                    reader.onloadend = function () {

                        var dataURL = reader.result;

                        var blob = that.dataURItoBlob(dataURL);

                        that.upload(blob); //执行上传接口

                    };

                }else{

                    alert('上传了非图片');

                }

            },

            dataURItoBlob (dataURI) {

                // base64 解码

                let byteString = window.atob(dataURI.split(',')[1]);

                let mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];

                let T = mimeString.split('/')[1];

                let ab = new ArrayBuffer(byteString.length);

                let ia = new Uint8Array(ab);

                for (let i = 0; i < byteString.length; i++) {

                    ia[i] = byteString.charCodeAt(i);

                }

                return new Blob([ab], {type: mimeString});

            },

            upload(imgUrl){

                var formdata = new FormData();

                formdata.append('file',imgUrl);//下面是要传递的参数

                axios.post("http://xxx.com/api/file",

                    formdata,

                    {headers:{'Content-Type':'multipart/form-data'}}

                ).then((res)=>{

                    if(res.data.code === 200){

                        alert('成功上传！');

                        this.postimg = res.data.data.url;

                    }else if(res.data.code === 401){

                        alert('未登录')

                    }else if(res.data.code === 403){

                        alert('未授权')

                    }else if(res.data.code === 422){

                        alert('验证失败信息')

                    }else if(res.data.code === 500){

                        alert('系统错误')

                    }

                })

            },