优化图片加载已修复fixed表现；优化导出功能，使导出效果与页面表格一致；

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
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+    "content-hash": "c3e52378111fa626fade09fbbe489d34",
     "packages": [
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             "name": "adbario/php-dot-notation",
@@ -1160,60 +1160,6 @@
             ],
             "time": "2021-10-07T12:57:01+00:00"
         },
-        {
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-            "require": {
-                "php": ">=7.0",
-                "phpoffice/phpspreadsheet": "^1.3"
-            },
-            "type": "extension",
-            "autoload": {
-                "psr-4": {
-                    "jianyan\\excel\\": "./src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "jianyan74"
-                }
-            ],
-            "description": "php excel 导入导出",
-            "keywords": [
-                "csv",
-                "excel",
-                "html",
-                "jianyan74",
-                "xls",
-                "xlsx"
-            ],
-            "support": {
-                "issues": "https://github.com/jianyan74/php-excel/issues",
-                "source": "https://github.com/jianyan74/php-excel/tree/1.0.2"
-            },
-            "time": "2020-09-04T06:16:34+00:00"
-        },
         {
             "name": "league/flysystem",
             "version": "1.1.9",
@@ -1764,16 +1710,16 @@
         },
         {
             "name": "phpoffice/phpspreadsheet",
-            "version": "1.21.0",
+            "version": "1.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
-                "reference": "1a359d2ccbb89c05f5dffb32711a95f4afc67964"
+                "reference": "3a9e29b4f386a08a151a33578e80ef1747037a48"
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-                "reference": "1a359d2ccbb89c05f5dffb32711a95f4afc67964",
+                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/3a9e29b4f386a08a151a33578e80ef1747037a48",
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@@ -1810,7 +1756,7 @@
                 "dompdf/dompdf": "^1.0",
                 "friendsofphp/php-cs-fixer": "^3.2",
                 "jpgraph/jpgraph": "^4.0",
-                "mpdf/mpdf": "^8.0",
+                "mpdf/mpdf": "8.0.17",
                 "phpcompatibility/php-compatibility": "^9.3",
                 "phpstan/phpstan": "^1.1",
                 "phpstan/phpstan-phpunit": "^1.0",
@@ -1868,9 +1814,9 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
-                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/1.21.0"
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/1.22.0"
             },
-            "time": "2022-01-06T11:10:08+00:00"
+            "time": "2022-02-18T12:57:07+00:00"
         },
         {
             "name": "psr/cache",