html不用任何控件上传文件

<form id="myform" action='/upload'  enctype="multipart/form-data">
<input type="file" accept="image/*">
<input type='submit'>

<form>

//引用jquery
$('#myform').on('sumbit', function(){
    var form = $(this);
    var formdata = false;
    if (window.FormData){
        formdata = new FormData(form[0]);
    }

    var formAction = form.attr('action');
    $.ajax({
        url         : '/upload',
        data        : formdata ? formdata : form.serialize(),
        cache       : false,
        contentType : false,
        processData : false,
        type        : 'POST',
        success     : function(data, textStatus, jqXHR){
            // Callback code
        }
    });
});