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return [
    'upload_path' => './uploads/', //ÉÏ´«Îļþ·¾¶
    'img_max_size' => 2 * 1024 * 1024, //×î´óÉÏ´«Í¼Æ¬¾Þϸ
    'img_allow_types' => 'jpg,png,gif,jpeg', //ÔÊÐíÉÏ´«µÄÎļþÀàÐÍ
];

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use think\facade\Request;
use think\facade\Filesystem;

class ImageUpload
{
    public function upload()
    {
        $img_file = Request::file('img'); //»ñÈ¡ÉÏ´«µÄͼƬÎļþ
        $img_path = config('upload_path'); //»ñÈ¡ÉÏ´«Â·¾¶
        $max_size = config('img_max_size'); //»ñÈ¡×î´óÎļþ³ß´ç
        $allow_types = config('img_allow_types'); //»ñÈ¡ÔÊÐíÉÏ´«µÄÀàÐÍ

        //ÅжÏÉÏ´«ÎļþÊÇ·ñÓÐÓᢾÞϸÊÇ·ñÇкϡ¢ÀàÐÍÊÇ·ñ׼ȷ
        if (!$img_file->isValid()) {
            return ['code' => 1, 'msg' => 'ÉÏ´«Í¼Æ¬ÎÞЧ'];
        }

        if ($img_file->getSize() > $max_size) {
            return ['code' => 2, 'msg' => 'ÉÏ´«Í¼Æ¬¾ÞϸÁè¼ÝÏÞÖÆ'];
        }

        if (!in_array($img_file->extension(), explode(',', $allow_types))) {
            return ['code' => 3, 'msg' => 'ÉÏ´«Í¼Æ¬ÀàÐͲ»Ö§³Ö'];
        }

        //ÉÏ´«Îļþ
        $file_info = $img_file->move($img_path);
        if ($file_info === false) {
            return ['code' => 4, 'msg' => 'ÉÏ´«Í¼Æ¬Ê§°Ü£¬ÇëÖØÊÔ'];
        }

        //·µ»ØÉÏ´«ÀÖ³ÉÐÅÏ¢
        $file_name = $file_info->getSaveName();
        $file_url = Filesystem::getDiskConfig('public', ['url' => '/'])->getVisibility()->url($img_path . $file_name);
        return ['code' => 0, 'msg' => 'ÉÏ´«Í¼Æ¬ÀÖ³É', 'url' => $file_url];
    }
}

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public function uploadImage()
{
    $result = (new ImageUpload())->upload();
    echo json_encode($result);
}

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<form id="image-form" action="/uploadImage" method="post" enctype="multipart/form-data">
    <input type="file" id="img-file" name="img" accept="image/*">
    <button type="submit">ÉÏ´«</button>
</form>

<script>
$(document).on('submit', '#image-form', function (event) {
    event.preventDefault(); 
    var formData = new FormData(document.getElementById('image-form'));
    $.ajax({
        url: '/uploadImage',
        type: 'post',
        data: formData,
        contentType: false,
        processData: false,
        dataType: 'json',
        success: function (res) {
            //´¦Öóͷ£ÉÏ´«Ð§¹û
        },
        error: function (xhr, textStatus, errorThrown) {
            console.log(errorThrown);
        }
    });
});
</script>

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