<input type="file" multiple accept="image/*" id="input" >

    inputElement.addEventListener("change", function () {
        const fileList = this.files; /* this -》 当前dom         */
        console.log(fileList)
        var reader = new FileReader();
        reader.onload = function (e) {
            console.log(e)
            /*获取图片base64*/
            let src=e.target.result;
            img.src=src;
            img.onload=function (e) {
                // console.log(e)

            };
            /*获取图片blob*/
            var objectURL = window.URL.createObjectURL(fileList[0]);
            console.log('objectURL',objectURL)

            // window.URL.revokeObjectURL(objectURL);//文档关闭会自动清除内存 也可手动关闭
        }
        reader.readAsDataURL(fileList[0]);
    }, false);