{"id":20281,"date":"2023-09-21T10:09:56","date_gmt":"2023-09-21T02:09:56","guid":{"rendered":"https:\/\/www.circuspi.com\/?p=20281"},"modified":"2023-09-21T11:31:19","modified_gmt":"2023-09-21T03:31:19","slug":"esp32-gpio","status":"publish","type":"post","link":"https:\/\/www.circuspi.com\/index.php\/2023\/09\/21\/esp32-gpio\/","title":{"rendered":"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa &#8211; \u5be6\u4f5c\u7bc7"},"content":{"rendered":"\n<p><style>\n\/* ###\u5be6\u9a57\u4e0b\u4e00\u5217### *\/\n\na:link {color:#0695e4\n;}    \/* \u8a2d\u5b9a\u5c1a\u672a\u9ede\u95b1\u904e\u7684\u9023\u7d50\u6a23\u5f0f *\/\na:visited {color:#0695e4\n;} \/* \u8a2d\u5b9a\u904e\u53bb\u66fe\u7d93\u95b1\u904e\u7684\u9023\u7d50 *\/\na:hover {color:#0695e4\n;}   \/* \u8a2d\u5b9a\u6ed1\u9f20\u6e38\u6a19\u6307\u5728\u9023\u7d50\u4f4d\u7f6e\u4e0a\u7684\u6a23\u5f0f *\/\na:active {color:#0000BB;}  \/* \u8a2d\u5b9a\u4e0a\u9ede\u64ca\u904e\u7684\u9023\u7d50\u6a23\u5f0f *\/\n<\/style><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"526\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/1000x526_1-2.jpg\" alt=\"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20477\"\/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u524d\u8a00<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.circuspi.com\/index.php\/2023\/08\/30\/esp32-gpio-1\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u4e0a\u7bc7<\/a>\u8aaa\u660e\u4e86<a href=\"https:\/\/www.icshop.com.tw\/categories\/esp32\" target=\"_blank\" rel=\"noreferrer noopener\"> ESP32 <\/a>\u7684\u8173\u4f4d\u548c GPIO \u7684\u529f\u80fd\u8207\u6ce8\u610f\u4e8b\u9805\uff0c\u672c\u7bc7\u5c07\u4ee5\u5169\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\u8aaa\u660e\u5982\u4f55\u4f7f\u7528 Arduino Framework \u63a7\u5236<a href=\"https:\/\/www.icshop.com.tw\/products\/368030501866\"> ESP32 \u958b\u767c\u677f<\/a>\u7684\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5167\u5efa\u7684\u4e0a\u62c9\u8207\u4e0b\u62c9\u96fb\u963b\u7c21\u5316\u96fb\u8def\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6750\u6599\u6e05\u55ae<\/h3>\n\n\n\n<ul>\n<li><a href=\"https:\/\/www.icshop.com.tw\/products\/368030501866\" target=\"_blank\" rel=\"noreferrer noopener\">ESP32 \u958b\u767c\u677f<\/a> x1<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/products\/368070100145\" target=\"_blank\" rel=\"noreferrer noopener\">micro USB \u50b3\u8f38\u7dda<\/a> x1<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/products\/368090200053\" target=\"_blank\" rel=\"noreferrer noopener\">\u9eb5\u5305\u677f<\/a> x1<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/products\/3681101000174\" target=\"_blank\" rel=\"noreferrer noopener\">\u516c\u5c0d\u516c\u675c\u90a6\u7dda<\/a> x1(\u7d44)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/categories\/%E6%8F%92%E6%9D%BF%E5%BC%8F%E9%9B%BB%E9%98%BBdip\" target=\"_blank\" rel=\"noreferrer noopener\">220\/470\u03a9 \u96fb\u963b<\/a> x1<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/categories\/5mm-led\" target=\"_blank\" rel=\"noreferrer noopener\">5mm LED<\/a> x1<\/li>\n\n\n\n<li><a href=\"https:\/\/www.icshop.com.tw\/categories\/%E8%BC%95%E8%A7%B8%E9%96%8B%E9%97%9C6x6\" target=\"_blank\" rel=\"noreferrer noopener\">\u6309\u9215\u958b\u95dc<\/a>(push button) x1<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u6578\u4f4d\u8f38\u51fa<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u8a9e\u6cd5\u8aaa\u660e<\/h3>\n\n\n\n<p>\u8981\u63a7\u5236\u6578\u4f4d\u8f38\u51fa\uff0c\u6703\u7528\u5230\u5169\u500b\u51fd\u5f0f\u8a9e\u6cd5\uff1a<code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">pinMode<\/mark><\/code>\u3001<code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">digitalWrite<\/mark><\/code>\u3002<\/p>\n\n\n\n<ul>\n<li><strong>pinMode<\/strong> <br>pinMode \u51fd\u5f0f\u7528\u4f86\u5b9a\u7fa9 GPIO \u63a5\u8173\u7684\u64cd\u4f5c\u6a21\u5f0f\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">pinMode<\/mark>(GPIO Pin, MODE);<\/code><\/pre>\n\n\n\n<p>\u53c3\u6578\u8aaa\u660e\uff1a<\/p>\n\n\n\n<p><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">GPIO Pin<\/mark><\/code> : GPIO \u63a5\u8173\u7de8\u865f<\/p>\n\n\n\n<p><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">MODE<\/mark><\/code> : \u63a5\u8173\u7684\u64cd\u4f5c\u6a21\u5f0f<\/p>\n\n\n\n<p>\u64cd\u4f5c\u6a21\u5f0f\u5171\u6709\u56db\u7a2e\uff0c\u53ef\u4ee5\u662f OUTPUT\uff08\u8f38\u51fa\u6a21\u5f0f\uff09\u3001INPUT\uff08\u8f38\u5165\u6a21\u5f0f\uff09\u3001INPUT_PULLUP\uff08\u4e0a\u62c9\u8f38\u5165\u6a21\u5f0f\uff09\uff0c\u6216INPUT_PULLDOWN\uff08\u4e0b\u62c9\u8f38\u5165\u6a21\u5f0f\uff09\u3002<\/p>\n\n\n\n<ul>\n<li><strong>digitalWrite<\/strong> digitalWrite \u51fd\u5f0f\u7528\u4f86\u8a2d\u5b9a GPIO \u63a5\u8173\u7684\u8f38\u51fa\u72c0\u614b\uff0c\u53ea\u6709\u5728 pinMode \u51fd\u5f0f\u8a2d\u5b9a\u6210 OUTPUT\uff08\u8f38\u51fa\u6a21\u5f0f\uff09\u6642\u624d\u80fd\u4f7f\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">digitalWrite<\/mark>(GPIO Pin, STATE);<\/code><\/pre>\n\n\n\n<p>\u53c3\u6578\u8aaa\u660e\uff1a<\/p>\n\n\n\n<p><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">GPIO Pin<\/mark><\/code> : GPIO \u63a5\u8173\u7de8\u865f<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\"><code>STATE<\/code> <\/mark>: \u63a5\u8173\u7684\u96fb\u4f4d\uff0c\u6709 HIGH(3.3 V)\u548cLOW (0 V)\u5169\u7a2e\u72c0\u614b\u3002<\/p>\n\n\n\n<p><strong>\ud83d\udca1 Tips<\/strong><\/p>\n\n\n\n<p>\u5728\u4f7f\u7528\u8f38\u51fa\u8173\u4f4d\u9023\u63a5\u5176\u4ed6\u5143\u4ef6\u6642\u5efa\u8b70\u52a0\u4e0a\u9650\u6d41\u96fb\u963b\uff0c\u4ee5\u514d\u640d\u58de\u63a5\u8173\u6216\u5143\u4ef6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7bc4\u4f8b1\uff1a\u9583\u720d LED \u71c8<\/h3>\n\n\n\n<p>\u8b93\u6211\u5011\u4ee5\u9583\u720d LED \u71c8\u70ba\u4f8b\uff0c\u8aaa\u660e\u5982\u4f55\u63a7\u5236 GPIO \u7684\u6578\u4f4d\u8f38\u51fa\u529f\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5143\u4ef6\u9023\u63a5\u793a\u610f\u5716<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/image.png\" alt=\"ESP32\u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20282\" width=\"435\" height=\"407\"\/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u63a5\u7dda\u5716<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/image-1.png\" alt=\"ESP32\u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20283\" width=\"480\" height=\"334\"\/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h3>\n\n\n\n<div style=\"overflow: auto; height: 380px; background-color: #0000;\"><script src=\"https:\/\/gist.github.com\/iCShop-Sophie\/01c4bede33694b5c12ba2719b6231100.js\"><\/script>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u57f7\u884c\u7d50\u679c<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"655\" height=\"391\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/20230913.gif\" alt=\"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20296\"\/><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u6578\u4f4d\u8f38\u5165<\/h2>\n\n\n\n<p>\u8981\u8b93 ESP32 \u7372\u5f97\u611f\u6e2c\u5668\u8cc7\u6599\u6216\u662f\u5916\u90e8\u8cc7\u8a0a\u6642\uff0c\u5c31\u9700\u8981\u5c07\u63a5\u8173\u8a2d\u5b9a\u70ba\u8f38\u5165\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p>\u5c07\u63a5\u8173\u8a2d\u5b9a\u70ba\u8f38\u5165\u72c0\u614b\u6642\u4e00\u6a23\u8981\u4f7f\u7528\u5230 <code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">pinMode<\/mark><\/code> \u8a9e\u6cd5\uff0c\u8a73\u7d30\u7684\u53c3\u6578\u8207\u7528\u9014\u53ef\u4ee5\u53c3\u8003\u524d\u9762\u7684\u8aaa\u660e\u3002\u8b80\u53d6\u8173\u4f4d\u72c0\u614b\u5247\u8981\u7528\u5230 <code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">digitalRead<\/mark><\/code> \u8a9e\u6cd5\u3002<\/p>\n\n\n\n<ul>\n<li><strong>digitalRead<\/strong><br>digitalRead \u51fd\u5f0f\u7684\u7528\u9014\u662f\u5c07 GPIO \u63a5\u8173\u8a2d\u5b9a\u6210\u8f38\u5165\u72c0\u614b\u3002 \u7531\u65bc ESP32 \u63a5\u8173\u9810\u8a2d\u7686\u70ba\u6578\u4f4d\u8f38\u5165\u6a21\u5f0f\uff0c\u6240\u4ee5\u5728\u8a2d\u5b9a\u6642\u53ea\u9700\u8981\u6307\u5b9a GPIO \u63a5\u8173\u7de8\u865f\u5373\u53ef\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">digitalRead<\/mark>(GPIO Pin);<\/code><\/pre>\n\n\n\n<p>\u53c3\u6578\u8aaa\u660e\uff1a<\/p>\n\n\n\n<p><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">GPIO Pin<\/mark><\/code> : GPIO\u63a5\u8173\u7de8\u865f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u9032\u968e\u77e5\u8b58\uff1a\u4e0a\u62c9\u96fb\u963b\u8207\u4e0b\u62c9\u96fb\u963b<\/h3>\n\n\n\n<p>\u7576\u5fae\u63a7\u5236\u5668\u7684\u63a5\u8173\u8a2d\u5b9a\u70ba\u8f38\u5165\u6a21\u5f0f\u6642\uff0c\u70ba\u4e86\u78ba\u4fdd\u63a5\u8173\u5728\u6c92\u6709\u5916\u90e8\u8a0a\u865f\u8f38\u5165\u7684\u72c0\u6cc1\u4e0b\uff0c\u4e5f\u80fd\u7dad\u6301\u5728\u7a69\u5b9a\u7684\u72c0\u614b\uff0c\u6211\u5011\u901a\u5e38\u6703\u52a0\u4e0a\u4e0a\u62c9(Pull-Up)\u96fb\u963b\u6216\u662f\u4e0b\u62c9(Pull-Down)\u96fb\u963b\u3002<\/p>\n\n\n\n<p>ESP32 \u63a5\u8173\u672c\u8eab\u5167\u5efa\u4e86\u4e0a\u62c9\u4ee5\u53ca\u4e0b\u62c9\u96fb\u963b\uff0c\u9664\u4e86 GPIO34, 35, 36, 39 \u4ee5\u5916\uff0c\u5176\u4ed6\u6240\u6709\u7684 GPIO \u63a5\u8173\u53ea\u8981\u5728 pinMode \u51fd\u5f0f\u4e2d\u8a2d\u5b9a\u5c31\u80fd\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u7576\u63a5\u8173\u8655\u65bc\u6d6e\u63a5\u72c0\u614b\u6642\uff0c\u53ef\u80fd\u6703\u53d7\u5230\u96dc\u8a0a\u5e72\u64fe\u800c\u7522\u751f\u8aa4\u52d5\u4f5c\uff0c\u800c\u4e0a\u62c9\u7684\u4f5c\u7528\u5c31\u662f\u5c07\u4e0d\u78ba\u5b9a\u7684\u8a0a\u865f\u72c0\u614b\u900f\u904e\u96fb\u963b\u63d0\u5347\u81f3\u9ad8\u96fb\u4f4d\uff1b\u4e0b\u62c9\u7684\u4f5c\u7528\u5247\u662f\u5c07\u4e0d\u78ba\u5b9a\u7684\u8a0a\u865f\u900f\u904e\u96fb\u963b\u62c9\u4f4e\u81f3\u4f4e\u96fb\u4f4d\uff0c\u5982\u6b64\u5c31\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u96fb\u4f4d\u8a0a\u865f\uff0c\u5e38\u7528\u4f86\u6aa2\u6e2c\u958b\u95dc\u6216\u6309\u9215\u7684\u72c0\u614b\u3002<\/p>\n\n\n\n<p>\u8981\u5206\u8fa8\u4e0a\u62c9\u6216\u662f\u4e0b\u62c9\u7684\u7d50\u69cb\uff0c\u53ef\u4ee5\u7531\u96fb\u963b\u6240\u5728\u7684\u4f4d\u7f6e\u5224\u65b7\u3002\u82e5\u96fb\u963b\u5176\u4e2d\u4e00\u7aef\u9023\u63a5\u5230\u9ad8\u96fb\u4f4d\u5c31\u662f\u4e0a\u62c9\u96fb\u963b(\u5de6\u5716) \uff1b\u9023\u63a5\u5230\u4f4e\u96fb\u4f4d\u7684\u5c31\u662f\u4e0b\u62c9\u96fb\u963b(\u53f3\u5716) \u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/02-\u539f\u7406\u5716-1.jpg\" alt=\"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20407\" width=\"878\" height=\"525\"\/><figcaption class=\"wp-element-caption\">\u5de6\u5716\u70ba\u4e0a\u62c9\u96fb\u963b\u7d50\u69cb\uff0c\u53f3\u5716\u70ba\u4e0b\u62c9\u96fb\u963b\u7d50\u69cb<\/figcaption><\/figure><\/div>\n\n\n<p><strong>\u4e0a\u62c9\u96fb\u963b<\/strong><\/p>\n\n\n\n<ul>\n<li>\u5206\u6790\uff1a\u5728\u6309\u9215\u9084\u6c92\u88ab\u6309\u4e0b\u4e4b\u524d\uff0c\u63a5\u8173\u6703\u7531\u4e0a\u62c9\u96fb\u963b\u63d0\u9ad8\u81f3\u9ad8\u96fb\u4f4d\uff1b\u6309\u4e0b\u6309\u9215\u4ee5\u5f8c\uff0c\u63a5\u8173\u8207 GND \u9023\u63a5\uff0c\u6b64\u6642\u63a5\u8173\u7684\u72c0\u614b\u70ba\u4f4e\u96fb\u4f4d\u3002<\/li>\n\n\n\n<li>\u8aaa\u660e\uff1a\u6709\u4e9b\u4eba\u5c07\u4e0a\u62c9\u96fb\u963b\u6bd4\u55bb\u6210\u5f48\u7c27\uff0c\u5728\u6c92\u6709\u53d7\u5230\u5916\u529b\u4f5c\u7528\u6642\uff0c\u5f48\u7c27\u6703\u62c9\u56de\u5230\u521d\u59cb\u4f4d\u7f6e\u3002\u76f8\u540c\u7684\uff0c\u7576\u6309\u9215\u88ab\u653e\u958b\u5f8c\uff0c\u4e0a\u62c9\u96fb\u963b\u6703\u5c07\u63a5\u8173\u96fb\u58d3\u62c9\u56de\u521d\u59cb\u9ad8\u96fb\u4f4d(3.3V)\u72c0\u614b\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4e0b\u62c9\u96fb\u963b<\/strong><\/p>\n\n\n\n<ul>\n<li>\u5206\u6790\uff1a\u5728\u958b\u95dc\u9084\u6c92\u88ab\u6309\u4e0b\u4e4b\u524d\uff0c\u63a5\u8173\u6703\u7531\u4e0b\u62c9\u96fb\u963b\u62c9\u4f4e\u81f3\u4f4e\u96fb\u4f4d(0V)\uff1b\u6309\u4e0b\u958b\u95dc\u4ee5\u5f8c\uff0c\u63a5\u8173\u8207 3.3V 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class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/04-LED\u8981\u4eae\u4e0d\u4eae.jpg\" alt=\"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - \u5be6\u4f5c\u7bc7\" class=\"wp-image-20408\" width=\"511\" height=\"454\"\/><figcaption class=\"wp-element-caption\">\u6309\u9215\u88ab\u6309\u4e0b\u6642\uff0cLED\u9ede\u4eae\uff1b\u6309\u9215\u6c92\u6709\u88ab\u6309\u4e0b\u6642\uff0cLED\u7184\u6ec5<\/figcaption><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5143\u4ef6\u9023\u63a5\u793a\u610f\u5716<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.circuspi.com\/wp-content\/uploads\/2023\/09\/image-4.png\" alt=\"ESP32 \u6559\u5b78\u7cfb\u5217(\u56db)\uff1a\u6578\u4f4d\u8f38\u5165\u8207\u8f38\u51fa - 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