正常的就是选择单个文件的而在html5中新增的mutiple属性才可以多选
最多只能添加三张图片
//下面用于多图片上传预览功能
function setImagePreviews(avalue) {
var docObj = document.getElementById("files");
var dd = document.getElementById("preview");
dd.innerHTML = "";
var fileList = docObj.files;
for (var i = 0; i < fileList.length; i++) {
dd.innerHTML += "
";
var imgObjPreview = document.getElementById("img"+i);
if (docObj.files && docObj.files[i]) {
//火狐下,直接设img属性
imgObjPreview.style.display = lock;
//控制缩略图大小
imgObjPreview.style.width = 5rem;
imgObjPreview.style.height =