关于html5:js多图片上传获取多个图片base64的值显示到页面

上传前显示成果

上传后显示成果

$('#img_purchase').on('click',function(){      $('#purchase').click();  }); $('#img_sale').on('click',function(){      $('#sale').click();  }); function getBase64 (file,Callback) {    let reader = new FileReader()      let imgResult = ''      reader.readAsDataURL(file)      reader.onload = function () {        imgResult = reader.result      }      reader.onerror = function (error) {        Callback(error)      }        reader.onloadend = function () {        Callback(imgResult)      }};    $(document).on('change', '#purchase', function () {        var filePath = $(this).val()        console.log(filePath);        var arr_prepath=this.files;        console.log(arr_prepath);        for (var i=0;i<arr_prepath.length;i++){            getBase64(arr_prepath[i],function(res){        console.log(res);                $('.img_addpurchase').before('<div class="le_img">'+                        '![](__JHWIMAGES__/ewc.png)'+                        '![]()'+                    '</div>',$('.purchase_top').firstChild);            })        }    });