var formdata = new FormData();
$("#upload_img").on("change", function(){
var files = !!this.files ? this.files : [];
if (!files.length || !window.FileReader) return;
for(var i=0;i<files.length;i++){
if (/^image/.test( files[i].type)){
var reader = new FileReader();
reader.readAsDataURL(files[i]);
formdata.append("img[]", files[i]);
reader.onloadend = function(){
$(‘#img_list‘).append("<img src=‘" + this.result + "‘>");
}
}
}
});
图片返回刷新
原文：http://www.cnblogs.com/mashil/p/6416380.html
