<style>
        .showFile{
            width: 200px;
            height: 200px;
            border: 1px solid blue;
        }
        .showFile img{
            width: 100px;
            height: 100px;
        }
</style>

    <div>
        <input type="file" id="file" multiple>
        <!--展示所上传的文件-->
        <div class="showFile">
        </div>
    </div>
    <script>
        file.onchange=function () {
                console.dir(this.files);
                //获取文件
                let fileOne=this.files;
                for(let i=0;i<fileOne.length;i++){
                    let newFile=new FileReader();
                    console.log(fileOne[i]);
                    if(fileOne[i].type.includes('image')){
                    newFile.readAsDataURL(fileOne[i])
                }else if(fileOne[i].type.includes('text')){
                    newFile.readAsText(fileOne[i],"GB2312")
                }
                newFile.onload=function () {
                    console.log('ff');
                    //获取读取资源的信息
                    let result=this.result;
                    console.log(result);
                    let dom='';
                    //获取showFile这个标签
                    let showFile=document.querySelector('.showFile');
                    if(fileOne[i].type.includes('image')){
                        let img=new Image();
                        img.src=result;
                        showFile.appendChild(img)
                    }else if(fileOne[i].type.includes('text')){
                        dom=document.createElement('p')
                        dom.innerHTML=result;
                        showFile.appendChild(dom)
                    }
                }
            }
        }
    </script>