表单元素file设置隐藏，通过其他元素打开：
.imgfile为input file
$(".ul").click(function () {return $(".imgfile").click();});
JS部分：
$(".imgfile").change(function () {var file = $(".imgfile").get(0).files[0];var reader = new FileReader();reader.readAsDataURL(file);reader.onloadend = function () {$("#Image1").attr("src", reader.result);}});$("#register2").click(function () {var IMG_BASE = $("#Image1").attr("src"); //要上传的图片的base64编码var IMG_ROUTE = $(".imgfile").val();//获取上传图片路径，为获取图片类型使用var IMG_ENDFOUR = IMG_ROUTE.substr(IMG_ROUTE.length - 4, 4);//截取路径后四位，判断图片类型var IMG_FOMATE = "jpeg"; //图片类型***if (IMG_ENDFOUR.trim() == ".jpg")IMG_FOMATE = "jpg";else if (IMG_ENDFOUR.trim() == ".png")IMG_FOMATE = "png";else if (IMG_ENDFOUR.trim() == ".bmp")IMG_FOMATE = "bmp";//图片正式开始上传 $.ajax({type: "post",url: "server/head.ashx",data: { 'imgBase': IMG_BASE, 'imgFormat': IMG_FOMATE },dataType: "text",success: function (data) {//data为返回的图片路径});});
一般处理程序部分：
using System.IO; //需要这三个命名空间using System.Drawing;//***using System.Drawing.Imaging;//*** string imgBase = context.Request["imgBase"];//传递过来的base64编码string imgFomate = context.Request["imgFormat"];//传递过来的图片格式string end = "1";string imgReadyBase = imgBase.Substring(imgBase.IndexOf("4") + 2);//截取base64编码无用开头byte[] bytes = System.Convert.FromBase64String(imgReadyBase);//base64转为byte数组MemoryStream ms = new MemoryStream(bytes);//创建内存流，将图片编码导入Image img = Image.FromStream(ms);//将流中的图片转换为Image图片对象//利用时间种子解决伪随机数短时间重复问题Random ran = new Random((int)DateTime.Now.Ticks);//文件保存位置及命名，精确到毫秒并附带一组随机数，防止文件重名，数据库保存路径为此变量string s = ran.Next().ToString();string serverPath = "../head/" + DateTime.Now.ToString("yyyyMMddhhmmssms") +s+ "." + imgFomate;//路径映射为绝对路径string path = context.Server.MapPath(serverPath);ImageFormat imgfor = ImageFormat.Jpeg;//设置图片格式if (imgFomate == "png") imgfor = ImageFormat.Png;try{img.Save(path, imgfor);//图片保存 }catch { end = "0"; }end = "head/" + DateTime.Now.ToString("yyyyMMddhhmmssms") +s+ "." + imgFomate;context.Response.Write(end);context.Response.End();
