ajax异步上传文件,图片

<input type="file" id="input-file-now" class="dropify" />
<button type="button" onclick="dropifyUpload()">上传</button>

<script>
    function dropifyUpload() {
        var formData = new FormData()  //创建一个forData
        formData.append('img', $('#input-file-now')[0].files[0]) //把file添加进去  name命名为img
        $.ajax({
            url: "https://localhost:5001/Store/OnPostUpload",
            type: 'POST',
            data: formData,
            async: false,
            cache: false,
            contentType: false,
            processData: false,
            success: function (returndata) {
                alert(returndata);
            },
            error: function (returndata) {
                alert(returndata);
            }
        });
    }
</script>
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