jQuery ajax upload image

$(function(){
new AjaxUpload('file1', {
action: 'uploadpic.asp',
name: 'form1',
data:{act:'uploadfile',FormName:'form1'},
autoSubmit:false,
responseType:'json',
onSubmit:function(file,ext){
if (!(ext && /^(jpg|png|gif)$/i.test(ext))){
alert('请您上传jpg|png|gif格式的图片!');
return false;
}
else{
$('#esave').show();
}
},
onComplete:function(file,response){
$('#esave').hide();
$('#pic').val(response.imgfile);
}
});
});