vue 上传图片 input=file

 一、逻辑

点击li触发事件chooseImage 即触发input标签事件photoChange

input标签事件photoChange

file返回的是如下变量

模拟上传表单方法

 执行上传

二、代码

<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')
                    }
                })
            },