html5 上传文件

<inputid="file_info"type="file"/>

varfd=newFormData(document.getElementById("file_info"));

fd.append("CustomField","Thisissomeextradata");

$.ajax({

url:"stash.php",

type:"POST",

data:fd,

processData:false,//telljQuerynottoprocessthedata

contentType:false//telljQuerynottosetcontentType

});