Js 点击按钮 选择文件后 自动上传文件

    /*批量导入*/    /*#load:为按钮,点击后生成一个隐藏的input file标签*/    $('#load').after('<input type="file" id="load_xls" name="file" style="display:none" onchange ="uploadFile()">');    $('#load').click(function(){        document.getElementById("load_xls").click();    });    function uploadFile() {        var myform = new FormData();        myform.append('file',$('#load_xls')[0].files[0]);        $.ajax({            url: "admin.php?r=org/orguser/addusers",            type: "POST",            data: myform,            contentType: false,            processData: false,            success: function (data) {                console.log(data);            },            error:function(data){                console.log(data)            }        });    }