{"id":32644,"date":"2024-11-25T09:29:28","date_gmt":"2024-11-25T01:29:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/32644\/"},"modified":"2024-11-25T09:29:28","modified_gmt":"2024-11-25T01:29:28","slug":"javascript%ef%bc%9a%e6%8e%8c%e6%8f%a1%e9%94%ae%e7%9b%98%e4%ba%8b%e4%bb%b6%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/32644\/","title":{"rendered":"JavaScript\uff1a\u638c\u63e1\u952e\u76d8\u4e8b\u4ef6\u5904\u7406"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/164\/169379814348038.jpg\" class=\"aligncenter\" title=\"JavaScript\uff1a\u638c\u63e1\u952e\u76d8\u4e8b\u4ef6\u5904\u7406\u63d2\u56fe\" alt=\"JavaScript\uff1a\u638c\u63e1\u952e\u76d8\u4e8b\u4ef6\u5904\u7406\u63d2\u56fe\" \/><\/p>\n<p>\u7f51\u7ad9\u5f00\u53d1\u4eba\u5458\u5e0c\u671b\u8bfb\u8005\u4ee5\u67d0\u79cd\u65b9\u5f0f\u4e0e\u4ed6\u4eec\u7684\u7f51\u7ad9\u8fdb\u884c\u4ea4\u4e92\u3002\u8bbf\u95ee\u8005\u53ef\u4ee5\u4e0a\u4e0b\u6eda\u52a8\u9875\u9762\u3001\u5728\u8f93\u5165\u5b57\u6bb5\u4e2d\u5199\u5165\u5185\u5bb9\u3001\u5355\u51fb\u94fe\u63a5\u8bbf\u95ee\u53e6\u4e00\u4e2a\u9875\u9762\uff0c\u6216\u8005\u6309\u7ec4\u5408\u952e\u89e6\u53d1\u7279\u5b9a\u884c\u4e3a\u3002\u4f5c\u4e3a\u5f00\u53d1\u4eba\u5458\uff0c\u60a8\u5e94\u8be5\u80fd\u591f\u6355\u83b7\u6240\u6709\u8fd9\u4e9b\u4e8b\u4ef6\u5e76\u5411\u7528\u6237\u63d0\u4f9b\u6240\u9700\u7684\u529f\u80fd\u3002<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u7684\u91cd\u70b9\u5c06\u662f\u5728 JavaScript \u4e2d\u5904\u7406\u952e\u76d8\u4e8b\u4ef6\u3002\u6211\u4eec\u5c06\u4e86\u89e3\u4e0d\u540c\u7c7b\u578b\u7684\u952e\u76d8\u4e8b\u4ef6\u3001\u5904\u7406\u7279\u6b8a\u6309\u952e\u4e8b\u4ef6\u4ee5\u53ca\u83b7\u53d6\u6709\u5173\u6309\u4e0b\u6216\u91ca\u653e\u7684\u6309\u952e\u7684\u4fe1\u606f\u3002<\/p>\n<h2>\u952e\u76d8\u4e8b\u4ef6\u7c7b\u578b<\/h2>\n<p>\u952e\u76d8\u4e8b\u4ef6\u5206\u4e3a\u4e09\u79cd\u7c7b\u578b\u3002\u8fd9\u4e9b\u79f0\u4e3a keydown\u3001keypress \u548c keyup\u3002<\/p>\n<p>\u53ea\u8981\u6309\u4e0b\u67d0\u4e2a\u952e\uff0c\u5c31\u4f1a\u89e6\u53d1 keydown \u4e8b\u4ef6\u3002\u6240\u6709\u952e\u90fd\u4f1a\u88ab\u89e6\u53d1\u3002\u5b83\u4eec\u662f\u5426\u4ea7\u751f\u89d2\u8272\u4ef7\u503c\u5e76\u4e0d\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u6309\u952e\u76d8\u4e0a\u7684 <strong>A<\/strong> \u6216 <strong>Alt<\/strong> \u952e\u5c06\u89e6\u53d1 keydown \u4e8b\u4ef6\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>keypress \u4e8b\u4ef6\u5df2\u5f03\u7528\u3002\u5b83\u4ec5\u5728\u6309\u4e0b\u4ea7\u751f\u5b57\u7b26\u503c\u7684\u952e\u65f6\u89e6\u53d1\u3002\u4f8b\u5982\uff0c\u6309 <strong>A<\/strong> \u952e\u5c06\u89e6\u53d1\u6b64\u4e8b\u4ef6\uff0c\u4f46\u6309 <strong>Alt<\/strong> \u952e\u5219\u4e0d\u4f1a\u3002\u60a8\u5e94\u8be5\u8003\u8651\u4f7f\u7528 keydown \u4e8b\u4ef6\u6765\u4ee3\u66ff\u5b83\u3002<\/p>\n<p>\u5f53\u7528\u6237\u6309\u4e0b\u7684\u952e\u88ab\u91ca\u653e\u65f6\uff0c\u5c06\u89e6\u53d1 keyup \u4e8b\u4ef6\u3002<\/p>\n<p>\u5047\u8bbe\u7528\u6237\u8fde\u7eed\u6309\u4e0b\u952e\u76d8\u4e0a\u7684\u4efb\u610f\u952e\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0ckeydown \u4e8b\u4ef6\u5c06\u88ab\u91cd\u590d\u89e6\u53d1\u3002\u4e00\u65e6\u7528\u6237\u91ca\u653e\u5bc6\u94a5\uff0c\u5c31\u4f1a\u89e6\u53d1 keyup \u4e8b\u4ef6\u3002<\/p>\n<h2>\u76d1\u542c\u952e\u76d8\u4e8b\u4ef6<\/h2>\n<p>\u6b64\u65f6\uff0c\u6211\u60f3\u63d0\u4e00\u4e9b\u76f8\u5f53\u660e\u663e\u7684\u4e8b\u60c5\u3002\u952e\u76d8\u662f\u4e00\u79cd\u8f93\u5165\u8bbe\u5907\uff0c\u7528\u4e8e\u4ece\u7528\u6237\u90a3\u91cc\u83b7\u53d6\u4e00\u4e9b\u8f93\u5165\u3002\u6211\u4eec\u6839\u636e\u8be5\u8f93\u5165\u91c7\u53d6\u884c\u52a8\u3002\u4f46\u662f\uff0c\u7528\u6237\u8fd8\u6709\u5176\u4ed6\u65b9\u5f0f\u53d1\u9001\u8f93\u5165\u3002<\/p>\n<p>\u5982\u679c\u60a8\u60f3\u8ddf\u8e2a\u7528\u6237\u5728\u8868\u5355\u4e2d\u586b\u5199\u7684\u4efb\u4f55\u8f93\u5165\u5b57\u6bb5\uff0c\u90a3\u4e48\u5728\u6240\u8ff0\u8f93\u5165\u4e0a\u4f7f\u7528\u5176\u4ed6\u4e8b\u4ef6\uff08\u4f8b\u5982 change \uff09\u66f4\u6709\u610f\u4e49\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u952e\u76d8\u4e8b\u4ef6\u4ec5\u4e3a\u53ef\u4ee5\u63a5\u6536\u7126\u70b9\u7684\u5143\u7d20\u751f\u6210\u3002\u8fd9\u5305\u62ec \u5143\u7d20\u3001 \u5143\u7d20\u3001&lt;summary&gt; \u5143\u7d20\u4ee5\u53ca\u5177\u6709 contentEditable \u6216 tabindex \u5c5e\u6027\u7684\u5176\u4ed6\u5143\u7d20\u3002&lt;\/summary&gt;<\/p>\n<p>\u4f8b\u5982\uff0c\u9664\u975e\u8bbe\u7f6e tabindex \u6216 contentEditable \u5c5e\u6027\uff0c\u5426\u5219\u60a8\u5c06\u65e0\u6cd5\u4fa6\u542c\u6bb5\u843d\u5143\u7d20\u4e0a\u7684\u952e\u76d8\u4e8b\u4ef6\u3002\u4f46\u662f\uff0c\u5b83\u6700\u7ec8\u4f1a\u5728 DOM \u6811\u4e2d\u5192\u6ce1\uff0c\u56e0\u6b64\u60a8\u4ecd\u7136\u53ef\u4ee5\u5c06 keydown \u6216 keyup \u4e8b\u4ef6\u4fa6\u542c\u5668\u9644\u52a0\u5230\u6587\u6863\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre>document.addEventListener(\"keydown\", keyIsDown);\n\nfunction keyIsDown(event) {\n    \/\/ Do whatever you want!\n}\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u60a8\u8fd8\u53ef\u4ee5\u5c06\u56de\u8c03\u4f5c\u4e3a\u7bad\u5934\u51fd\u6570\u63d0\u4f9b\uff1a<\/p>\n<pre>document.addEventListener(\"keydown\", (event) =&amp;gt; {\n    \/\/ Do whatever you want!\n});\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<h2>\u4ece\u952e\u76d8\u4e8b\u4ef6\u83b7\u53d6\u4fe1\u606f<\/h2>\n<p>\u5728\u4e0a\u4e00\u8282\u7684\u57fa\u672c\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u3002\u8be5\u51fd\u6570\u63a5\u53d7 event \u5bf9\u8c61\u4f5c\u4e3a\u5176\u53c2\u6570\u3002\u6b64 event \u5bf9\u8c61\u5305\u542b\u60a8\u53ef\u80fd\u9700\u8981\u8bbf\u95ee\u7684\u4e0e keydown \u6216 keyup \u4e8b\u4ef6\u76f8\u5173\u7684\u6240\u6709\u4fe1\u606f\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u60a8\u5e94\u8be5\u4e86\u89e3\u7684\u4e00\u4e9b\u6709\u7528\u5c5e\u6027\uff1a<\/p>\n<ol>\n<li> <strong>key<\/strong>\uff1a\u8be5\u5c5e\u6027\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6240\u6309\u952e\u7684\u5b57\u7b26\u503c\u3002<\/li>\n<li> <strong>code<\/strong>\uff1a\u6b64\u5c5e\u6027\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6309\u4e0b\u7684\u7269\u7406\u952e\u7684\u4ee3\u7801\u3002<\/li>\n<li> <strong>repeat<\/strong>\uff1a\u5982\u679c\u957f\u65f6\u95f4\u6309\u4f4f\u67d0\u4e2a\u952e\uff0c\u8be5\u5c5e\u6027\u5c06\u8fd4\u56de\u5e03\u5c14\u503c true\uff0c\u5bfc\u81f4 keydown \u4e8b\u4ef6\u591a\u6b21\u89e6\u53d1\u3002<\/li>\n<li> <strong>altKey<\/strong>\uff1a\u5982\u679c\u7528\u6237\u6309\u4e0b <strong>Alt<\/strong> \u952e\uff08\u5728 Windows \u4e0a\uff09\u6216 <strong>Option<\/strong> \u952e\uff08\u5728\u5728 macOS \u4e0a\uff09\u5f53 keydown \u4e8b\u4ef6\u89e6\u53d1\u65f6\u3002<\/li>\n<li> <strong>ctrlKey<\/strong>\uff1a\u5982\u679c\u7528\u6237\u5728 keydown \u4e8b\u4ef6\u89e6\u53d1\u65f6\u6309\u4e0b <strong>Control<\/strong> \u952e\uff0c\u5219\u6b64\u5c5e\u6027\u8fd4\u56de\u5e03\u5c14\u503c true\u3002<\/li>\n<li> <strong>metaKey<\/strong>\uff1a\u5982\u679c\u7528\u6237\u5728 keydown \u4e8b\u4ef6\u89e6\u53d1\u65f6\u6309\u4e0b <strong>Meta<\/strong> \u952e\uff0c\u5219\u6b64\u5c5e\u6027\u8fd4\u56de\u5e03\u5c14\u503c true\u3002<\/li>\n<li> <strong>shiftKey<\/strong>\uff1a\u5982\u679c\u7528\u6237\u5728 keydown \u4e8b\u4ef6\u89e6\u53d1\u65f6\u6309\u4e0b <strong>Shift<\/strong> \u952e\uff0c\u5219\u6b64\u5c5e\u6027\u8fd4\u56de\u5e03\u5c14\u503c true\u3002<\/li>\n<\/ol>\n<p>\u60a8\u4f1a\u6ce8\u610f\u5230\uff0c\u6211\u5728\u6240\u6709\u6700\u540e\u56db\u4e2a\u5c5e\u6027\u63cf\u8ff0\u4e2d\u90fd\u5305\u542b\u4e86\u201c\u5f53 keydown \u4e8b\u4ef6\u88ab\u89e6\u53d1\u65f6\u201d\u90e8\u5206\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u5728\u6267\u884c\u4e0a\u8ff0\u4efb\u4e00\u64cd\u4f5c\u65f6\u6309\u4e0b <strong>A<\/strong> \u6216 <strong>3<\/strong> \u7b49\u952e\uff0c\u8fd9\u4e9b\u5c5e\u6027\u7684\u503c\u5c06\u4e3a true \uff0c\u7528\u4e8e keydown \u4e8b\u4ef6\u3002\u952e\u4e5f\u5904\u4e8e\u6309\u4e0b\u72b6\u6001\u3002<\/p>\n<p>\u91cd\u70b9\u5173\u6ce8\u4ee5\u4e0b CodePen \u6f14\u793a\u540e\uff0c\u5c1d\u8bd5\u6309\u5355\u4e2a\u952e\u6216\u7ec4\u5408\u952e\uff0c\u4ee5\u67e5\u770b\u4e0d\u540c\u5c5e\u6027\u7684\u503c\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<\/p>\n<p>\u5982\u679c\u60a8\u6309\u952e\u76d8\u9876\u90e8\u7684 <strong>3<\/strong> \u952e\u800c\u4e0d\u6309 <strong>Shift<\/strong> \u952e\uff0c\u5219 key \u5c5e\u6027\u7684\u503c\u5c06\u53d8\u4e3a <strong>3<\/strong> &gt; \u5e76\u4e14 code \u5c5e\u6027\u7684\u503c\u53d8\u4e3a <strong>Digit3<\/strong>\u3002\u4f46\u662f\uff0c\u6309\u4e0b <strong>Shift<\/strong> \u540e\uff0ckey \u5c5e\u6027\u7684\u503c\u5c06\u53d8\u4e3a <strong>#<\/strong>\uff0c\u800c code \u5c5e\u6027\u4ecd\u4e3a <strong>Digit3<\/strong>\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u5176\u4ed6\u7ec4\u5408\u952e\u8fdb\u884c\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u60a8\u4f1a\u6ce8\u610f\u5230 key \u5c5e\u6027\u7684\u503c\u4f1a\u6839\u636e\u60a8\u6309\u4e0b\u7684\u952e\u800c\u53d8\u5316\u3002\u4f46\u662f\uff0ccode \u5c5e\u6027\u7684\u503c\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n<p>\u952e\u76d8\u4e0a\u7684\u67d0\u4e9b\u952e\u901a\u5e38\u662f\u91cd\u590d\u7684\u3002\u4f8b\u5982\uff0c\u6709\u4e24\u4e2a Shift \u952e\u3002\u6309\u5de6\u952e\u4f1a\u5c06 code \u7684\u503c\u8bbe\u7f6e\u4e3a ShiftLeft\u3002\u6309\u53f3\u8fb9\u4f1a\u5c06 code \u7684\u503c\u8bbe\u7f6e\u4e3a ShiftRight\u3002\u540c\u6837\uff0c\u6709\u4e24\u7ec4\u6570\u5b57\u952e\u3002\u5b57\u6bcd\u4e0a\u65b9\u7684\u4ee3\u7801\u5c06\u4e3a\u60a8\u63d0\u4f9b Digit \u4ee3\u7801\uff0c\u800c\u6570\u5b57\u952e\u76d8\u4e0a\u7684\u4ee3\u7801\u5c06\u4e3a\u60a8\u63d0\u4f9b Numpad \u4ee3\u7801\u3002 <\/p>\n<p>\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u60a8\u7684\u4ee3\u7801\u4f9d\u8d56\u4e8e\u68c0\u6d4b\u7279\u5b9a\u952e\uff0c\u5219\u52a1\u5fc5\u786e\u4fdd\u60a8\u4f7f\u7528 code \u5c5e\u6027\u6765\u68c0\u67e5\u6309\u4e0b\u4e86\u54ea\u4e2a\u952e\u3002<\/p>\n<p>\u6211\u60f3\u63d0\u7684\u53e6\u4e00\u4ef6\u91cd\u8981\u7684\u4e8b\u60c5\u662f\uff0c\u5e76\u4e0d\u662f\u6bcf\u4e2a\u4eba\u90fd\u4f7f\u7528 QWERTY \u952e\u76d8\uff0c\u800c\u4e14\u4ed6\u4eec\u7684\u952e\u76d8\u751a\u81f3\u53ef\u80fd\u4e0d\u662f\u82f1\u6587\u7684\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 key \u5c5e\u6027\u6765\u68c0\u67e5\u6309\u4e0b\u4e86\u54ea\u4e2a\u952e\u5f88\u5bb9\u6613\u51fa\u9519\u3002<\/p>\n<h2>\u54cd\u5e94\u952e\u76d8\u4e8b\u4ef6<\/h2>\n<p>\u73b0\u5728\u6211\u4eec\u77e5\u9053\u4e86\u5982\u4f55\u76d1\u542c\u952e\u76d8\u4e8b\u4ef6\u5e76\u4ece\u4e2d\u63d0\u53d6\u4fe1\u606f\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e9b\u4ee3\u7801\u6765\u5bf9\u67d0\u4e9b\u7279\u5b9a\u952e\u7684 keydown \u548c keyup \u4e8b\u4ef6\u505a\u51fa\u53cd\u5e94\u3002\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre>const circle = document.querySelector(\".circle\");\n\ndocument.addEventListener(\"keydown\", (event) =&amp;gt; {\n    \n  if (event.code == \"KeyR\" &amp;amp;&amp;amp; event.repeat != true) {\n    let rVal = Math.floor(200 + Math.random() * 200);\n    circle.setAttribute(\"style\", `width: ${rVal}px; height: ${rVal}px;`);\n  }\n\n  if (event.key == \"B\" &amp;amp;&amp;amp; event.shiftKey == true) {\n    let rVal = Math.floor(10 + Math.random() * 40);\n    circle.setAttribute(\"style\", `border: ${rVal}px solid orangered;`);\n  }\n\n  if (event.code == \"ArrowUp\" &amp;amp;&amp;amp; event.repeat != true) {\n    circle.classList.add(\"animate__animated\", \"animate__bounce\");\n  }\n});\n\ndocument.addEventListener(\"keyup\", (event) =&amp;gt; {\n  if (event.code == \"ArrowUp\") {\n    setTimeout(() =&amp;gt; {\n      circle.classList.remove(\"animate__animated\", \"animate__bounce\");\n    }, 4000);\n  }\n});\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u6211\u4eec\u4e3a keydown \u4e8b\u4ef6\u521b\u5efa\u4e86\u4e00\u4e2a\u4fa6\u542c\u5668\uff0c\u5e76\u4e3a keyup \u4e8b\u4ef6\u521b\u5efa\u4e86\u53e6\u4e00\u4e2a\u4fa6\u542c\u5668\u3002\u8fd9\u4e24\u4e2a\u4e8b\u4ef6\u90fd\u9644\u52a0\u5230 document\u3002<\/p>\n<p>\u5728 keydown \u5185\uff0c\u6211\u4eec\u68c0\u67e5\u4e09\u4e2a\u4e0d\u540c\u7684\u5bc6\u94a5\u3002\u6211\u4f7f\u7528\u4e86 <strong>R<\/strong> \u952e\u7684 event.code \u5c5e\u6027\u6765\u5411\u60a8\u5c55\u793a\u60a8\u53ef\u4ee5\u5355\u72ec\u6309 <strong>R<\/strong> \u952e\u6216\u4e0e\u4efb\u4f55\u4fee\u9970\u952e\u7ec4\u5408\u4f7f\u7528\uff0c\u5e76\u4e14\u5b83\u4ecd\u4f1a\u5c06\u5706\u7684\u534a\u5f84\u66f4\u6539\u4e3a\u968f\u673a\u503c\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u6211\u4eec\u4f7f\u7528 event.key \u5c5e\u6027\u6765\u68c0\u67e5\u5176\u503c\u662f\u5426\u4e3a <strong>B<\/strong>\u3002\u4ec5\u5f53\u60a8\u540c\u65f6\u6309 <strong>Shift<\/strong> \u548c <strong>B<\/strong> \u65f6\uff0c\u6b64\u5757\u4e2d\u7684\u4ee3\u7801\u624d\u4f1a\u6267\u884c\u200b\u200b\uff0c\u56e0\u4e3a\u8fd9\u79cd\u7ec4\u5408\u4f1a\u5bfc\u81f4 event.key \u5c5e\u6027\u6210\u4e3a\u5927\u5199\u201cB\u201d\u3002 <\/p>\n<p>\u5728 keyup \u5185\uff0c\u6211\u4eec\u68c0\u67e5 ArrowUp \u952e\u4e0a\u7684 keyup \u4e8b\u4ef6\u3002\u4e00\u65e6\u94a5\u5319\u88ab\u89e3\u9664\uff0c\u6211\u4eec\u4f1a\u5728\u56db\u79d2\u7684\u5ef6\u8fdf\u540e\u5220\u9664\u4e4b\u524d\u9644\u52a0\u7684\u7c7b\u3002<\/p>\n<p>\u4ee5\u4e0b CodePen \u6f14\u793a\u5c55\u793a\u4e86\u8fd9\u4e00\u5207\u7684\u5b9e\u9645\u6548\u679c\uff1a<\/p>\n<\/p>\n<p>\u60a8\u5e94\u8be5\u5c1d\u8bd5\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u6dfb\u52a0\u81ea\u5df1\u7684\u903b\u8f91\uff0c\u4ee5\u4fbf\u5f53\u7528\u6237\u6309\u4e0b<strong>A<\/strong>\u3001<strong>S<\/strong>\u3001<strong>W<\/strong>\u952e\u65f6\u5706\u5708\u4f1a\u79fb\u52a8&gt; 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