js 原生图片批量上传

<input id="fileuploadBatch1" type="file" name="batchImg" multiple="multiple"
       onchange="xmTanUploadImg(this)">
<input type="hidden" name="banner_image" />

//批量上传
    var imgArr = [];
    var strImg='';
    var  j=0;
    //选择图片，马上预览
    function xmTanUploadImg(obj) {
        var fl=obj.files.length;
        var flag = false;

        for(var i=0;i<fl;i++){
            var file=obj.files[i];
            // console.log(file)
            // 表单对象，用于将文件传到后台
            var formData = new FormData();
            formData.append('imgFile', file);
            $.ajax({
                url : "landing.php?act=ajax",
                type : "post",
                dataType: 'json',
                cache: false,
                data:formData,
                processData: false,
                contentType: false,
                async:false,
                success: function(result) {
                    if(result.code==200){
                        j++;
                        imgArr.push(result.msg)
                        alert("成功上传了第"+j+"张")
                    }else{
                        alert(result.msg)
                    }

                }
            });
        }
        strImg = imgArr.join(',')
        $("input[name='banner_image']").val(strImg)
    }