{"id":117888,"date":"2025-08-04T14:43:14","date_gmt":"2025-08-04T07:43:14","guid":{"rendered":"https:\/\/tino.vn\/blog\/?p=117888"},"modified":"2026-01-02T17:38:56","modified_gmt":"2026-01-02T10:38:56","slug":"cach-sua-loi-jquery-is-not-defined","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/cach-sua-loi-jquery-is-not-defined\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn c\u00e1ch s\u1eeda l\u1ed7i jQuery Is Not Defined trong WordPress [2026]"},"content":{"rendered":"\n<p><strong>Trong qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng v\u00e0 t\u1ed1i \u01b0u website <a href=\"https:\/\/tino.vn\/blog\/wordpress-la-gi\/\" data-type=\"post\" data-id=\"15589\" target=\"_blank\" rel=\"noreferrer noopener\">WordPress<\/a>, l\u1ed7i &#8220;jQuery Is Not Defined&#8221; l\u00e0 m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn khi\u1ebfn trang web ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng \u0111\u00fang \u00fd. V\u1eady nguy\u00ean nh\u00e2n l\u00e0 do \u0111\u00e2u v\u00e0 c\u00e1ch s\u1eeda l\u1ed7i WordPress jQuery Is Not Defined nh\u01b0 th\u1ebf n\u00e0o? C\u00f9ng Tino t\u00ecm hi\u1ec3u qua b\u00e0i vi\u1ebft n\u00e0y nh\u00e9!<\/strong><\/p>\n\n\n\n<h2 id=\"L\u1ed7i_&#8220;WordPress_jQuery_Is_Not_Defined&#8221;_l\u00e0_g\u00ec?\"><a id=\"post-117888-_jb7biokgtexf\"><\/a>L\u1ed7i &#8220;WordPress jQuery Is Not Defined&#8221; l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p>L\u1ed7i &#8220;WordPress jQuery Is Not Defined&#8221; x\u1ea3y ra khi m\u1ed9t trang web WordPress c\u1ed1 g\u1eafng s\u1eed d\u1ee5ng th\u01b0 vi\u1ec7n jQuery nh\u01b0ng kh\u00f4ng th\u1ec3 t\u00ecm th\u1ea5y ho\u1eb7c t\u1ea3i \u0111\u01b0\u1ee3c th\u01b0 vi\u1ec7n n\u00e0y, th\u01b0\u1eddng do jQuery ch\u01b0a \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p \u0111\u00fang c\u00e1ch ho\u1eb7c b\u1ecb xung \u0111\u1ed9t trong qu\u00e1 tr\u00ecnh t\u1ea3i.<\/p>\n\n\n\n<p>jQuery l\u00e0 m\u1ed9t th\u01b0 vi\u1ec7n JavaScript ph\u1ed5 bi\u1ebfn gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c vi\u1ebft m\u00e3 t\u01b0\u01a1ng t\u00e1c tr\u00ean website, v\u00e0 WordPress m\u1eb7c \u0111\u1ecbnh \u0111\u00e3 t\u00edch h\u1ee3p s\u1eb5n jQuery \u0111\u1ec3 h\u1ed7 tr\u1ee3 c\u00e1c t\u00ednh n\u0103ng nh\u01b0 menu dropdown, slider ho\u1eb7c c\u00e1c hi\u1ec7u \u1ee9ng \u0111\u1ed9ng. Tuy nhi\u00ean, l\u1ed7i c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n n\u1ebfu theme ho\u1eb7c plugin b\u1ea1n \u0111ang s\u1eed d\u1ee5ng y\u00eau c\u1ea7u jQuery nh\u01b0ng n\u00f3 b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a (do xung \u0111\u1ed9t phi\u00ean b\u1ea3n), \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn file jQuery b\u1ecb sai ho\u1eb7c m\u1ed9t \u0111o\u1ea1n m\u00e3 t\u00f9y ch\u1ec9nh kh\u00f4ng khai b\u00e1o \u0111\u00fang c\u00e1ch.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-1.png\" alt=\"L\u1ed7i &quot;WordPress jQuery Is Not Defined&quot; l\u00e0 g\u00ec?\" class=\"wp-image-117898\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-1.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-1-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>L\u1ed7i &#8220;WordPress jQuery Is Not Defined&#8221; l\u00e0 g\u00ec?<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>\u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn vi\u1ec7c c\u00e1c ch\u1ee9c n\u0103ng ph\u1ee5 thu\u1ed9c v\u00e0o jQuery ng\u1eebng ho\u1ea1t \u0111\u1ed9ng, g\u00e2y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng v\u00e0 kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb c\u1ee7a trang web.<\/p>\n\n\n\n<h3 id=\"Nguy\u00ean_nh\u00e2n_ch\u00ednh_g\u00e2y_ra_l\u1ed7i_&#8220;jQuery_Is_Not_Defined&#8221;_trong_WordPress\"><a id=\"post-117888-_wlg7de73a3b2\"><\/a><strong>Nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y ra l\u1ed7i &#8220;jQuery Is Not Defined&#8221; trong WordPress<\/strong><\/h3>\n\n\n\n<h4 id=\"Thi\u1ebfu_th\u01b0_vi\u1ec7n_jQuery\"><a id=\"post-117888-_fmxama6ckx4f\"><\/a>Thi\u1ebfu th\u01b0 vi\u1ec7n jQuery<\/h4>\n\n\n\n<p>WordPress kh\u00f4ng t\u1ef1 \u0111\u1ed9ng t\u1ea3i jQuery tr\u1eeb khi theme ho\u1eb7c plugin y\u00eau c\u1ea7u. N\u1ebfu m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n c\u1ea7n jQuery nh\u01b0ng l\u1ea1i kh\u00f4ng g\u1ecdi th\u01b0 vi\u1ec7n n\u00e0y \u0111\u00fang c\u00e1ch, tr\u00ecnh duy\u1ec7t s\u1ebd b\u00e1o l\u1ed7i &#8220;jQuery is not defined&#8221;.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n\njQuery(document).ready(function() {\n\nconsole.log(\"Trang web \u0111\u00e3 s\u1eb5n s\u00e0ng!\");\n\n});\n\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p>N\u1ebfu WordPress ch\u01b0a n\u1ea1p jQuery tr\u01b0\u1edbc \u0111o\u1ea1n m\u00e3 n\u00e0y, n\u00f3 s\u1ebd ngay l\u1eadp t\u1ee9c b\u00e1o l\u1ed7i.<\/p>\n\n\n\n<h4 id=\"Th\u1ee9_t\u1ef1_t\u1ea3i_script_b\u1ecb_sai\"><a id=\"post-117888-_wnifn2q13l0q\"><\/a>Th\u1ee9 t\u1ef1 t\u1ea3i script b\u1ecb sai<\/h4>\n\n\n\n<p>WordPress s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng h\u00e0ng \u0111\u1ee3i wp_enqueue_script() \u0111\u1ec3 qu\u1ea3n l\u00fd script. N\u1ebfu jQuery \u0111\u01b0\u1ee3c t\u1ea3i sau c\u00e1c file JavaScript t\u00f9y ch\u1ec9nh c\u1ea7n d\u00f9ng \u0111\u1ebfn n\u00f3, l\u1ed7i n\u00e0y s\u1ebd xu\u1ea5t hi\u1ec7n.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>File custom.js c\u1ee7a b\u1ea1n g\u1ecdi jQuery, nh\u01b0ng jQuery l\u1ea1i n\u1eb1m sau custom.js trong danh s\u00e1ch file t\u1ea3i.<\/li>\n\n\n\n<li>S\u1eed d\u1ee5ng defer ho\u1eb7c async kh\u00f4ng \u0111\u00fang ch\u1ed7 khi\u1ebfn script t\u1ea3i l\u1ec7ch th\u1ee9 t\u1ef1.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-2.png\" alt=\"Nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y ra l\u1ed7i &quot;jQuery Is Not Defined&quot; trong WordPress\" class=\"wp-image-117899\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-2.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-2-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>Nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y ra l\u1ed7i &#8220;jQuery Is Not Defined&#8221; trong WordPress<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<h4 id=\"Xung_\u0111\u1ed9t_plugin_ho\u1eb7c_theme\"><a id=\"post-117888-_93xfevaxy774\"><\/a>Xung \u0111\u1ed9t plugin ho\u1eb7c theme<\/h4>\n\n\n\n<p>M\u1ed9t s\u1ed1 plugin ho\u1eb7c theme t\u1ef1 \u0111\u1ed9ng g\u1ecdi jQuery t\u1eeb ngu\u1ed3n ngo\u00e0i (nh\u01b0 <a href=\"https:\/\/tino.vn\/blog\/cdn-la-gi\/\" target=\"_blank\" data-type=\"post\" data-id=\"203\" rel=\"noreferrer noopener\">CDN<\/a> c\u1ee7a Google) thay v\u00ec d\u00f9ng phi\u00ean b\u1ea3n WordPress t\u00edch h\u1ee3p s\u1eb5n. \u0110i\u1ec1u n\u00e0y d\u1ec5 d\u1eabn \u0111\u1ebfn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>G\u1ecdi nhi\u1ec1u phi\u00ean b\u1ea3n jQuery c\u00f9ng l\u00fac g\u00e2y xung \u0111\u1ed9t.<\/li>\n\n\n\n<li>L\u1ed7i &#8220;jQuery is not defined&#8221; do phi\u00ean b\u1ea3n jQuery kh\u00f4ng t\u01b0\u01a1ng th\u00edch.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"Phi\u00ean_b\u1ea3n_jQuery_l\u1ed7i_th\u1eddi_ho\u1eb7c_kh\u00f4ng_t\u01b0\u01a1ng_th\u00edch\"><a id=\"post-117888-_sggnwr0s7l9\"><\/a>Phi\u00ean b\u1ea3n jQuery l\u1ed7i th\u1eddi ho\u1eb7c kh\u00f4ng t\u01b0\u01a1ng th\u00edch<\/h4>\n\n\n\n<p>WordPress th\u01b0\u1eddng c\u1eadp nh\u1eadt phi\u00ean b\u1ea3n jQuery k\u00e8m theo l\u00f5i h\u1ec7 th\u1ed1ng. N\u1ebfu theme ho\u1eb7c plugin g\u1ecdi phi\u00ean b\u1ea3n jQuery qu\u00e1 c\u0169 (ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i, b\u1ea3n m\u1edbi nh\u01b0ng kh\u00f4ng t\u01b0\u01a1ng th\u00edch), d\u1ec5 x\u1ea3y ra l\u1ed7i.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Phi\u00ean b\u1ea3n jQuery c\u0169 thi\u1ebfu h\u00e0m c\u1ea7n thi\u1ebft cho m\u00e3 JavaScript hi\u1ec7n \u0111\u1ea1i.<\/li>\n\n\n\n<li>Plugin c\u1ed1 t\u00ecnh thay th\u1ebf jQuery g\u1ed1c c\u1ee7a WordPress d\u1eabn \u0111\u1ebfn l\u1ed7i \u0111\u1ecbnh ngh\u0129a.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"C\u1ea5u_h\u00ecnh_sai_trong_file_functions.php\"><a id=\"post-117888-_fhpmsql3hq3i\"><\/a>C\u1ea5u h\u00ecnh sai trong file functions.php<\/h4>\n\n\n\n<p>M\u1ed9t s\u1ed1 theme t\u00f9y ch\u1ec9nh file functions.php kh\u00f4ng \u0111\u00fang c\u00e1ch, d\u1eabn \u0111\u1ebfn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V\u00f4 t\u00ecnh x\u00f3a b\u1ecf jQuery m\u1eb7c \u0111\u1ecbnh c\u1ee7a WordPress (wp_deregister_script).<\/li>\n\n\n\n<li>G\u1ecdi nh\u1ea7m phi\u00ean b\u1ea3n ho\u1eb7c kh\u00f4ng t\u1ea3i \u0111\u00fang th\u01b0 vi\u1ec7n c\u1ea7n thi\u1ebft.<\/li>\n<\/ul>\n\n\n\n<p>V\u00ed d\u1ee5 l\u1ed7i ph\u1ed5 bi\u1ebfn:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function remove_default_jquery() {\n\nwp_deregister_script('jquery');\n\n}\n\nadd_action('wp_enqueue_scripts', 'remove_default_jquery');<\/code><\/pre>\n\n\n\n<p>\u0110o\u1ea1n m\u00e3 tr\u00ean s\u1ebd x\u00f3a b\u1ecf jQuery m\u1eb7c \u0111\u1ecbnh, n\u1ebfu b\u1ea1n qu\u00ean thay th\u1ebf b\u1eb1ng phi\u00ean b\u1ea3n kh\u00e1c s\u1ebd khi\u1ebfn l\u1ed7i xu\u1ea5t hi\u1ec7n ngay l\u1eadp t\u1ee9c.<\/p>\n\n\n\n<h4 id=\"L\u1ed7i_\u0111\u01b0\u1eddng_d\u1eabn_ho\u1eb7c_CDN\"><a id=\"post-117888-_1dkgvg89t5a1\"><\/a>L\u1ed7i \u0111\u01b0\u1eddng d\u1eabn ho\u1eb7c CDN<\/h4>\n\n\n\n<p>N\u1ebfu jQuery \u0111\u01b0\u1ee3c t\u1ea3i t\u1eeb m\u1ed9t CDN b\u00ean ngo\u00e0i (Content Delivery Network) v\u00e0 CDN \u0111\u00f3 g\u1eb7p s\u1ef1 c\u1ed1 (v\u00ed d\u1ee5: kh\u00f4ng kh\u1ea3 d\u1ee5ng ho\u1eb7c b\u1ecb ch\u1eb7n b\u1edfi t\u01b0\u1eddng l\u1eeda), tr\u00ecnh duy\u1ec7t s\u1ebd kh\u00f4ng th\u1ec3 t\u1ea3i \u0111\u01b0\u1ee3c th\u01b0 vi\u1ec7n jQuery. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn l\u1ed7i &#8220;jQuery Is Not Defined&#8221;.<\/p>\n\n\n\n<h2 id=\"4_c\u00e1ch_s\u1eeda_l\u1ed7i_jQuery_Is_Not_Defined_trong_WordPress_hi\u1ec7u_qu\u1ea3\"><a id=\"post-117888-_zas4w5t0pufm\"><\/a>4 c\u00e1ch s\u1eeda l\u1ed7i jQuery Is Not Defined trong WordPress hi\u1ec7u qu\u1ea3<\/h2>\n\n\n\n<p>L\u01b0u \u00fd quan tr\u1ecdng: Tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 thao t\u00e1c ch\u1ec9nh s\u1eeda n\u00e0o, h\u00e3y sao l\u01b0u (backup) website \u0111\u1ec3 tr\u00e1nh m\u1ea5t d\u1eef li\u1ec7u quan tr\u1ecdng n\u1ebfu x\u1ea3y ra s\u1ef1 c\u1ed1 nh\u00e9!<\/p>\n\n\n\n<h3 id=\"1._Th\u00eam_\u0111o\u1ea1n_m\u00e3_v\u00e0o_file_wp-config.php\"><a id=\"post-117888-_gv3h31ibbr9l\"><\/a><strong>1. Th\u00eam \u0111o\u1ea1n m\u00e3 v\u00e0o file wp-config.php<\/strong><\/h3>\n\n\n\n<p>C\u00e1ch \u0111\u1ea7u ti\u00ean v\u00e0 c\u0169ng l\u00e0 c\u00e1ch ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 thi\u1ebft l\u1eadp \u0111\u01b0\u1eddng d\u1eabn tuy\u1ec7t \u0111\u1ed1i (ABSPATH) trong file l\u00f5i WordPress.<\/p>\n\n\n\n<p>B\u1ea1n h\u00e3y m\u1edf file <strong>wp-config.php<\/strong> th\u00f4ng qua File Manager trong cPanel ho\u1eb7c FTP Client nh\u01b0 FileZilla v\u00e0 ch\u00e8n \u0111o\u1ea1n m\u00e3 sau:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if ( !defined('ABSPATH') )\n\ndefine('ABSPATH', dirname(__FILE__) . '\/');\n\ndefine('CONCATENATE_SCRIPTS', false);<\/code><\/pre>\n\n\n\n<p>Gi\u1ea3i th\u00edch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ABSPATH: <\/strong>\u0110\u1ecbnh ngh\u0129a \u0111\u01b0\u1eddng d\u1eabn ch\u00ednh x\u00e1c \u0111\u1ebfn th\u01b0 m\u1ee5c c\u00e0i \u0111\u1eb7t WordPress.<\/li>\n\n\n\n<li><strong>CONCATENATE_SCRIPTS: <\/strong>Thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb false gi\u00fap WordPress kh\u00f4ng n\u1ed1i c\u00e1c file script l\u1ea1i v\u1edbi nhau, t\u1eeb \u0111\u00f3 gi\u1ea3m nguy c\u01a1 l\u1ed7i jQuery kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-3.png\" alt=\"Th\u00eam \u0111o\u1ea1n m\u00e3 v\u00e0o file wp-config.php\" class=\"wp-image-117900\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-3.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-3-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>Th\u00eam \u0111o\u1ea1n m\u00e3 v\u00e0o file wp-config.php<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<h3 id=\"2._Th\u00eam_jQuery_t\u1eeb_Google_k\u00e8m_d\u1ef1_ph\u00f2ng_(Fallback)\"><strong><strong>2. <\/strong>Th\u00eam jQuery t\u1eeb Google k\u00e8m d\u1ef1 ph\u00f2ng (Fallback)<\/strong><\/h3>\n\n\n\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng jQuery qua CDN gi\u00fap website t\u1ea3i nhanh h\u01a1n. Tuy nhi\u00ean, \u0111\u00f4i khi CDN b\u1ecb l\u1ed7i ho\u1eb7c m\u1ea5t k\u1ebft n\u1ed1i s\u1ebd g\u00e2y ra l\u1ed7i jQuery. \u0110\u1ec3 kh\u1eafc ph\u1ee5c, b\u1ea1n c\u00f3 th\u1ec3 th\u00eam ph\u01b0\u01a1ng \u00e1n d\u1ef1 ph\u00f2ng (fallback) nh\u01b0 sau:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n\nwindow.jQuery || document.write('&lt;script src=\"http:\/\/mysite.com\/jquery.min.js\"&gt;&lt;\\\/script&gt;')\n\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p>Gi\u1ea3i th\u00edch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>window.jQuery: <\/strong>Ki\u1ec3m tra xem jQuery \u0111\u00e3 t\u1ea3i ch\u01b0a.<\/li>\n\n\n\n<li>N\u1ebfu ch\u01b0a, document.write() s\u1ebd t\u1ef1 \u0111\u1ed9ng t\u1ea3i file jQuery t\u1eeb \u0111\u01b0\u1eddng d\u1eabn d\u1ef1 ph\u00f2ng tr\u00ean server c\u1ee7a b\u1ea1n (mysite.com).<\/li>\n<\/ul>\n\n\n\n<p><strong>M\u1eb9o: <\/strong>B\u1ea1n c\u00f3 th\u1ec3 thay http:\/\/mysite.com\/jquery.min.js b\u1eb1ng link jQuery t\u1ea3i s\u1eb5n t\u1eeb th\u01b0 vi\u1ec7n c\u1ee7a b\u1ea1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<h3 id=\"3._Th\u00eam_th\u01b0_vi\u1ec7n_jQuery_th\u1ee7_c\u00f4ng_v\u00e0o_header.php\"><a id=\"post-117888-_n5ildkk0o2gk\"><\/a><strong>3. Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php<\/strong><\/h3>\n\n\n\n<p>N\u1ebfu hai c\u00e1ch tr\u00ean v\u1eabn kh\u00f4ng kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c l\u1ed7i, b\u1ea1n c\u00f3 th\u1ec3 th\u1eed ch\u00e8n tr\u1ef1c ti\u1ebfp th\u01b0 vi\u1ec7n jQuery v\u00e0o file header.php c\u1ee7a theme.<\/p>\n\n\n\n<p><strong>B\u01b0\u1edbc 1: <\/strong>V\u00e0o trang <a href=\"https:\/\/developers.google.com\/speed\/libraries?hl=vi\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Google Hosted Libraries <\/a>v\u00e0 sao ch\u00e9p \u0111o\u1ea1n m\u00e3 CDN phi\u00ean b\u1ea3n jQuery m\u1edbi nh\u1ea5t.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-4.png\" alt=\"Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php\" class=\"wp-image-117901\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-4.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-4-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"https:\/\/ajax.googleapis.com\/ajax\/libs\/jquery\/3.7.1\/jquery.min.js\"&gt;&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p><strong>B\u01b0\u1edbc 2:<\/strong> M\u1edf file <strong>header.php<\/strong> trong th\u01b0 m\u1ee5c theme c\u1ee7a b\u1ea1n (<strong>wp-content\/themes\/t\u00ean-theme<\/strong>).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-5.png\" alt=\"Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php\" class=\"wp-image-117902\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-5.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-5-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>B\u01b0\u1edbc 3: <\/strong>D\u00e1n \u0111o\u1ea1n m\u00e3 v\u1eeba sao ch\u00e9p ngay b\u00ean d\u01b0\u1edbi th\u1ebb &lt;head&gt; nh\u01b0 sau:<\/p>\n\n\n\n<p><strong>&lt;head&gt;<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"https:\/\/ajax.googleapis.com\/ajax\/libs\/jquery\/3.7.1\/jquery.min.js\"&gt;&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<p><strong>&lt;\/head&gt;<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-6.png\" alt=\"Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php\" class=\"wp-image-117903\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-6.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-6-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>Th\u00eam th\u01b0 vi\u1ec7n jQuery th\u1ee7 c\u00f4ng v\u00e0o header.php<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>B\u01b0\u1edbc 4: <\/strong>L\u01b0u l\u1ea1i file v\u00e0 ki\u1ec3m tra xem l\u1ed7i \u0111\u00e3 bi\u1ebfn m\u1ea5t ch\u01b0a.<\/p>\n\n\n\n<p><strong>M\u1eb9o:<\/strong> C\u00e1ch n\u00e0y c\u0169ng \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c cho c\u00e1c th\u01b0 vi\u1ec7n JavaScript kh\u00e1c nh\u01b0 Bootstrap, Vue.js, \u2026<\/p>\n\n\n\n<h4 id=\"\u0110\u1ea3m_b\u1ea3o_jQuery_\u0111\u00e3_\u0111\u01b0\u1ee3c_t\u1ea3i_\u0111\u00fang_c\u00e1ch\"><a id=\"post-117888-_5pcr0ywqdtui\"><\/a>\u0110\u1ea3m b\u1ea3o jQuery \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u00fang c\u00e1ch<\/h4>\n\n\n\n<p>N\u1ebfu b\u1ea1n \u0111\u00e3 ch\u00e8n jQuery m\u00e0 l\u1ed7i v\u1eabn xu\u1ea5t hi\u1ec7n, c\u00f3 th\u1ec3 v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf vi\u1ec7c m\u00e3 ngu\u1ed3n kh\u00f4ng t\u1ea3i \u0111\u00fang th\u01b0 vi\u1ec7n.<\/p>\n\n\n\n<p><strong>B\u01b0\u1edbc 1:<\/strong> Ki\u1ec3m tra m\u00e3 ngu\u1ed3n trang web b\u1eb1ng c\u00e1ch nh\u1ea5n <strong>F12<\/strong> ho\u1eb7c chu\u1ed9t ph\u1ea3i ch\u1ecdn <strong>Inspect Element (Ki\u1ec3m tra<\/strong>) tr\u00ean tr\u00ecnh duy\u1ec7t -&gt; ch\u1ecdn<strong> Console<\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-7.png\" alt=\"\u0110\u1ea3m b\u1ea3o jQuery \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u00fang c\u00e1ch\" class=\"wp-image-117904\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-7.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2025\/08\/sua-loi-jQuery-Is-Not-Defined-7-300x171.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption class=\"wp-element-caption\"><strong>\u0110\u1ea3m b\u1ea3o jQuery \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u00fang c\u00e1ch<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>B\u01b0\u1edbc 2: <\/strong>T\u00ecm th\u1ebb <strong>&lt;script src=&#8221;&#8221;<\/strong>&gt; trong ph\u1ea7n <strong>&lt;head&gt;<\/strong> \u0111\u1ec3 x\u00e1c nh\u1eadn jQuery \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea3i \u0111\u00fang ch\u01b0a.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111o\u1ea1n m\u00e3 c\u1ea7n t\u00ecm:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"\/js\/jquery-3.7.1.0.min.js\" type=\"text\/javascript\"&gt;&lt;\/script&gt;\n\n&lt;script src=\"https:\/\/ajax.googleapis.com\/ajax\/libs\/jquery\/3.7.1\/j query.min.js\"&gt;&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>N\u1ebfu URL sai ho\u1eb7c thi\u1ebfu d\u1ea5u (\/), h\u00e3y ch\u1ec9nh l\u1ea1i \u0111\u01b0\u1eddng d\u1eabn \u0111\u00fang.<\/li>\n\n\n\n<li>\u0110\u1ec3 ki\u1ec3m tra link jQuery ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng, copy URL v\u00e0 d\u00e1n th\u1eb3ng l\u00ean tr\u00ecnh duy\u1ec7t xem c\u00f3 t\u1ea3i \u0111\u01b0\u1ee3c file kh\u00f4ng.<\/li>\n<\/ul>\n\n\n\n<p><strong>Meo: <\/strong>Khi sao ch\u00e9p link, h\u00e3y ki\u1ec3m tra k\u1ef9 xem c\u00f3 d\u00ednh kho\u1ea3ng tr\u1eafng th\u1eeba \u1edf \u0111\u1ea7u ho\u1eb7c cu\u1ed1i URL kh\u00f4ng \u2014 \u0111\u00e2y l\u00e0 l\u1ed7i nh\u1ecf nh\u01b0ng r\u1ea5t d\u1ec5 g\u00e2y ra l\u1ed7i l\u1edbn!<\/p>\n\n\n\n<h3 id=\"4._C\u1eadp_nh\u1eadt_WordPress,_plugin_v\u00e0_theme\"><a id=\"post-117888-_5qcr9ibmcbg9\"><\/a><strong>4. C\u1eadp nh\u1eadt WordPress, plugin v\u00e0 theme<\/strong><\/h3>\n\n\n\n<h4 id=\"C\u1eadp_nh\u1eadt_phi\u00ean_b\u1ea3n_WordPress_m\u1edbi_nh\u1ea5t\"><a id=\"post-117888-_11lc0rckoz6t\"><\/a>C\u1eadp nh\u1eadt phi\u00ean b\u1ea3n WordPress m\u1edbi nh\u1ea5t<\/h4>\n\n\n\n<p>Tr\u01b0\u1edbc ti\u00ean, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng phi\u00ean b\u1ea3n WordPress c\u1ed1t l\u00f5i c\u1ee7a b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt.<\/p>\n\n\n\n<p>Truy c\u1eadp v\u00e0o <strong>Dashboard (B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n)<\/strong> -&gt; <strong>Updates (C\u1eadp nh\u1eadt)<\/strong>.<\/p>\n\n\n\n<p>N\u1ebfu c\u00f3 b\u1ea3n c\u1eadp nh\u1eadt m\u1edbi, h\u00e3y nh\u1ea5p v\u00e0o &#8220;<strong>Update to version X.X.X<\/strong>&#8221; \u0111\u1ec3 ti\u1ebfn h\u00e0nh n\u00e2ng c\u1ea5p.<\/p>\n\n\n\n<h4 id=\"C\u1eadp_nh\u1eadt_plugin_v\u00e0_theme_WordPress\"><a id=\"post-117888-_hovp9zux8hoy\"><\/a>C\u1eadp nh\u1eadt plugin v\u00e0 theme WordPress<\/h4>\n\n\n\n<p>Ngay b\u00ean d\u01b0\u1edbi ph\u1ea7n c\u1eadp nh\u1eadt WordPress core, b\u1ea1n s\u1ebd th\u1ea5y danh s\u00e1ch c\u00e1c plugin c\u1ea7n c\u1eadp nh\u1eadt. Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c plugin c\u1ea7n n\u00e2ng c\u1ea5p v\u00e0 nh\u1ea5n &#8220;<strong>Update Plugins<\/strong>&#8220;.<\/p>\n\n\n\n<p>T\u01b0\u01a1ng t\u1ef1, b\u1ea1n v\u00e0o m\u1ee5c<strong> Giao di\u1ec7n<\/strong> -&gt; Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c theme v\u00e0 nh\u1ea5n &#8220;<strong>Update Themes<\/strong>&#8221; \u0111\u1ec3 c\u1eadp nh\u1eadt.<\/p>\n\n\n\n<h3 id=\"K\u1ebft_lu\u1eadn\"><a id=\"post-117888-_eus13akj6sra\"><\/a><strong>K\u1ebft lu\u1eadn<\/strong><\/h3>\n\n\n\n<p>L\u1ed7i &#8220;WordPress jQuery Is Not Defined Error&#8221; c\u00f3 th\u1ec3 khi\u1ebfn website m\u1ea5t \u0111i nhi\u1ec1u t\u00ednh n\u0103ng quan tr\u1ecdng v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng. Tuy nhi\u00ean, ch\u1ec9 c\u1ea7n n\u1eafm v\u1eefng nguy\u00ean nh\u00e2n v\u00e0 \u00e1p d\u1ee5ng \u0111\u00fang c\u00e1ch c\u00e1c b\u01b0\u1edbc kh\u1eafc ph\u1ee5c tr\u00ean, b\u1ea1n ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft l\u1ed7i n\u00e0y m\u1ed9t c\u00e1ch tri\u1ec7t \u0111\u1ec3. Ch\u00fac b\u1ea1n th\u00e0nh c\u00f4ng!<\/p>\n\n\n\n<h2 id=\"Nh\u1eefng_c\u00e2u_h\u1ecfi_th\u01b0\u1eddng_g\u1eb7p\"><a id=\"post-117888-_b430ic8usckl\"><\/a>Nh\u1eefng c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"Plugin_n\u00e0o_th\u01b0\u1eddng_g\u00e2y_ra_l\u1ed7i_n\u00e0y?\">Plugin n\u00e0o th\u01b0\u1eddng g\u00e2y ra l\u1ed7i n\u00e0y?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p>C\u00e1c plugin t\u1ed1i \u01b0u h\u00f3a nh\u01b0 Autoptimize, WP Rocket, ho\u1eb7c plugin n\u00e9n script c\u00f3 th\u1ec3 v\u00f4 hi\u1ec7u h\u00f3a jQuery, d\u1eabn \u0111\u1ebfn l\u1ed7i. Do \u0111\u00f3, h\u00e3y ki\u1ec3m tra k\u1ef9 c\u00e0i \u0111\u1eb7t c\u1ee7a ch\u00fang.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"N\u1ebfu_t\u00f4i_kh\u00f4ng_r\u00e0nh_code_th\u00ec_sao?\">N\u1ebfu t\u00f4i kh\u00f4ng r\u00e0nh code th\u00ec sao?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 th\u1eed t\u1eaft t\u1eebng plugin \u0111\u1ec3 t\u00ecm nguy\u00ean nh\u00e2n, sau \u0111\u00f3 li\u00ean h\u1ec7 v\u1edbi nh\u00e0 ph\u00e1t tri\u1ec3n theme\/plugin ho\u1eb7c thu\u00ea chuy\u00ean gia WordPress \u0111\u1ec3 s\u1eeda.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"Bi\u1ec3u_hi\u1ec7n_c\u1ee7a_l\u1ed7i_WordPress_jQuery_Is_Not_Defined_Error_l\u00e0_g\u00ec?\">Bi\u1ec3u hi\u1ec7n c\u1ee7a l\u1ed7i WordPress jQuery Is Not Defined Error l\u00e0 g\u00ec?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<ul class=\"wp-block-list\">\n<li>C\u00e1c t\u00ednh n\u0103ng ph\u1ee5 thu\u1ed9c v\u00e0o jQuery (nh\u01b0 menu dropdown, slider, ho\u1eb7c hi\u1ec7u \u1ee9ng \u0111\u1ed9ng) kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.<\/li>\n\n\n\n<li>M\u1ed9t s\u1ed1 ph\u1ea7n c\u1ee7a website b\u1ecb h\u1ecfng ho\u1eb7c hi\u1ec3n th\u1ecb kh\u00f4ng \u0111\u00fang c\u00e1ch (v\u00ed d\u1ee5: n\u00fat b\u1ea5m kh\u00f4ng ph\u1ea3n h\u1ed3i, h\u00ecnh \u1ea3nh kh\u00f4ng t\u1ea3i \u0111\u01b0\u1ee3c).<\/li>\n\n\n\n<li>Trang web c\u00f3 th\u1ec3 load ch\u1eadm ho\u1eb7c kh\u00f4ng hi\u1ec3n th\u1ecb \u0111\u1ea7y \u0111\u1ee7 n\u1ed9i dung.<\/li>\n<\/ul>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"L\u1ed7i_n\u00e0y_c\u00f3_\u1ea3nh_h\u01b0\u1edfng_SEO_kh\u00f4ng?\">L\u1ed7i n\u00e0y c\u00f3 \u1ea3nh h\u01b0\u1edfng SEO kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p>B\u1ea3n th\u00e2n l\u1ed7i &#8220;jQuery is not defined&#8221; kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 x\u1ebfp h\u1ea1ng tr\u1ef1c ti\u1ebfp trong thu\u1eadt to\u00e1n c\u1ee7a Google. 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