{"id":32702,"date":"2024-11-25T10:03:30","date_gmt":"2024-11-25T02:03:30","guid":{"rendered":"https:\/\/fwq.ai\/blog\/32702\/"},"modified":"2024-11-25T10:03:30","modified_gmt":"2024-11-25T02:03:30","slug":"javascript%ef%bc%9a%e6%8d%95%e8%8e%b7%e9%94%ae%e7%9b%98%e4%ba%8b%e4%bb%b6%e5%b9%b6%e5%81%9a%e5%87%ba%e5%8f%8d%e5%ba%94","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/32702\/","title":{"rendered":"JavaScript\uff1a\u6355\u83b7\u952e\u76d8\u4e8b\u4ef6\u5e76\u505a\u51fa\u53cd\u5e94"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/164\/169383222464455.jpg\" class=\"aligncenter\" title=\"JavaScript\uff1a\u6355\u83b7\u952e\u76d8\u4e8b\u4ef6\u5e76\u505a\u51fa\u53cd\u5e94\u63d2\u56fe\" alt=\"JavaScript\uff1a\u6355\u83b7\u952e\u76d8\u4e8b\u4ef6\u5e76\u505a\u51fa\u53cd\u5e94\u63d2\u56fe\" \/><\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u5982\u4f55\u5728 JavaScript \u4e2d\u6355\u83b7\u5e76\u54cd\u5e94\u4e0d\u540c\u7684\u952e\u76d8\u4e8b\u4ef6\u3002\u6211\u5c06\u5411\u60a8\u5c55\u793a\u51e0\u4e2a\u73b0\u5b9e\u4e16\u754c\u7684\u793a\u4f8b\uff0c\u4ee5\u4f7f\u5176\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n<p>JavaScript \u662f\u7f51\u7edc\u7684\u6838\u5fc3\u6280\u672f\u4e4b\u4e00\u3002\u5927\u591a\u6570\u7f51\u7ad9\u90fd\u4f7f\u7528\u5b83\uff0c\u5e76\u4e14\u6240\u6709\u73b0\u4ee3\u7f51\u7edc\u6d4f\u89c8\u5668\u90fd\u652f\u6301\u5b83\uff0c\u800c\u4e0d\u9700\u8981\u63d2\u4ef6\u3002\u5728\u672c\u7cfb\u5217\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e0d\u540c\u7684\u63d0\u793a\u548c\u6280\u5de7\uff0c\u5b83\u4eec\u5c06\u5e2e\u52a9\u60a8\u8fdb\u884c\u65e5\u5e38 JavaScript \u5f00\u53d1\u3002<\/p>\n<p>\u4f5c\u4e3a\u4e00\u540d JavaScript \u5f00\u53d1\u4eba\u5458\uff0c\u6709\u65f6\u60a8\u9700\u8981\u5b9e\u73b0\u4e00\u4e9b\u529f\u80fd\uff0c\u8981\u6c42\u60a8\u5904\u7406\u952e\u76d8\u4e8b\u4ef6\u5e76\u6839\u636e\u5b83\u4eec\u6267\u884c\u64cd\u4f5c\u3002\u5e78\u8fd0\u7684\u662f\uff0cJavaScript \u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u7684 KeyboardEvent \u5bf9\u8c61\uff0c\u5b83\u5141\u8bb8\u60a8\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u952e\u76d8\u4e8b\u4ef6\u3002<\/p>\n<h2>JavaScript \u4e2d\u7684\u952e\u76d8\u4e8b\u4ef6<\/h2>\n<p>\u5728 JavaScript \u4e2d\uff0cKeyboardEvent \u5bf9\u8c61\u63d0\u4f9b\u4e86\u4e09\u4e2a\u4e8b\u4ef6\uff1a\u6309\u952e\u6309\u4e0b\u3001\u6309\u952e\u6309\u4e0b\u548c\u6309\u952e\u5f39\u8d77\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u5f53\u60a8\u6309\u4e0b\u952e\u76d8\u4e0a\u7684\u4efb\u610f\u952e\u65f6\uff0c\u4e00\u7cfb\u5217\u4e8b\u4ef6\u5c06\u6309\u4ee5\u4e0b\u987a\u5e8f\u53d1\u751f\u3002<\/p>\n<ul>\n<li>\u6309\u4e0b\u952e<\/li>\n<li>\u6309\u952e<\/li>\n<li>\u6309\u952e<\/li>\n<\/ul>\n<p>\u5f53\u6309\u4e0b\u952e\u76d8\u4e0a\u7684\u4efb\u610f\u952e\u65f6\uff0c\u4f1a\u89e6\u53d1\u6309\u952e\u4e8b\u4ef6\u3002\u5e76\u4e14\u5982\u679c\u957f\u65f6\u95f4\u6309\u4e0b\u67d0\u4e2a\u952e\uff0c\u5219\u4f1a\u91cd\u590d\u89e6\u53d1\u6309\u952e\u6309\u4e0b\u4e8b\u4ef6\u3002<\/p>\n<p>\u6309\u952e\u4e8b\u4ef6\u4e3b\u8981\u5728\u6309\u4e0b\u4efb\u4f55\u53ef\u6253\u5370\u5b57\u7b26\u65f6\u89e6\u53d1\uff0c\u5e76\u5728\u6309\u952e\u4e8b\u4ef6\u540e\u89e6\u53d1\u3002\u4e8b\u5b9e\u4e0a\uff0c\u6309\u952e\u4e8b\u4ef6\u7528\u4e8e\u4e2d\u7ee7\u6309\u952e\u4e8b\u4ef6\u4ea7\u751f\u7684\u5b57\u7b26\u3002\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u975e\u5b57\u7b26\u952e\u4e0d\u4f1a\u5f15\u53d1\u6309\u952e\u4e8b\u4ef6\u3002\u5c3d\u7ba1\u67d0\u4e9b\u6d4f\u89c8\u5668\u652f\u6301\u6b64\u4e8b\u4ef6\uff0c\u4f46\u4e0d\u5efa\u8bae\u4f9d\u8d56\u6b64\u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u5c06\u4ece\u7f51\u7edc\u6807\u51c6\u4e2d\u5220\u9664\u3002<\/p>\n<p><span><\/span> \u6309\u952e\u4e8b\u4ef6\u5df2\u88ab\u5f03\u7528\uff0c\u5e76\u5c06\u5728\u73b0\u4ee3\u6d4f\u89c8\u5668\u4e2d\u9010\u6b65\u6dd8\u6c70\u3002 <\/p>\n<p>\u6700\u540e\uff0c\u91ca\u653e\u6309\u952e\u65f6\u4f1a\u5f15\u53d1\u6309\u952e\u4e8b\u4ef6\u3002\u57fa\u672c\u4e0a\uff0c\u6309\u952e\u6309\u4e0b\u548c\u6309\u952e\u6309\u4e0b\u4e8b\u4ef6\u7684\u7ec4\u5408\u4e3a\u60a8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4ee3\u7801\uff0c\u8be5\u4ee3\u7801\u6307\u793a\u6309\u4e0b\u7684\u952e\u3002<\/p>\n<p>\u6bcf\u4e2a\u952e\u76d8\u4e8b\u4ef6\u90fd\u63d0\u4f9b\u4e24\u4e2a\u91cd\u8981\u7684\u5c5e\u6027\uff1akey \u548c code\u3002 key \u5c5e\u6027\u7528\u6309\u4e0b\u7684\u5b57\u7b26\u586b\u5145\uff0c\u800c code \u5c5e\u6027\u7528\u5b57\u7b26\u7684\u7269\u7406\u952e\u4f4d\u7f6e\u586b\u5145\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6309 a \u5b57\u7b26\u952e\uff0c\u5219 key \u5c5e\u6027\u5c06\u586b\u5145\u4e3a a\uff0c\u5e76\u4e14 code \u5c5e\u6027\u5c06\u586b\u5145\u4e3a KeyA \u5e38\u91cf\u3002\u4f46\u662f\uff0c\u6309\u4e0b\u7684\u952e\u7801\u4e0d\u4e00\u5b9a\u4e0e\u5b57\u7b26\u76f8\u540c\uff01\u5982\u679c\u7528\u6237\u8bbe\u7f6e\u4e86\u5907\u7528\u952e\u76d8\u5e03\u5c40\uff0c\u4f8b\u5982 Dvorak\uff0c\u5219\u6309\u76f8\u540c\u7684\u952e\u4ee3\u7801\u5c06\u4ea7\u751f\u4e0d\u540c\u7684\u5b57\u7b26\u3002<\/p>\n<p>\u4ee5\u4e0a\u662f JavaScript \u4e2d\u952e\u76d8\u4e8b\u4ef6\u7684\u7b80\u8981\u6982\u8ff0\u3002\u4ece\u4e0b\u4e00\u8282\u5f00\u59cb\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u8fd9\u4e9b\u4e8b\u4ef6\u4ee5\u53ca\u73b0\u5b9e\u4e16\u754c\u7684\u793a\u4f8b\uff0c\u4ee5\u4e86\u89e3\u5b83\u4eec\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002<\/p>\n<h2>keydown \u4e8b\u4ef6<\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u4e86\u89e3 keydown \u4e8b\u4ef6\u5982\u4f55\u5728 JavaScript \u4e2d\u5de5\u4f5c\u3002\u5f53\u6309\u4e0b\u952e\u76d8\u4e0a\u7684\u4efb\u610f\u952e\u65f6\uff0c\u4f1a\u89e6\u53d1 keydown \u4e8b\u4ef6\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u5feb\u901f\u6d4f\u89c8\u4e00\u4e0b\u4ee5\u4e0b\u793a\u4f8b\u3002<\/p>\n<pre>document.addEventListener('keydown', (event) =&amp;gt; {\n  var keyValue = event.key;\n  var codeValue = event.code;\n\n  console.log(\"keyValue: \" + keyValue);\n  console.log(\"codeValue: \" + codeValue);\n}, false);\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5982\u60a8\u6240\u89c1\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u76d1\u542c\u5668\u6765\u76d1\u542c keydown \u4e8b\u4ef6\u3002\u6bcf\u5f53\u6309\u4e0b\u4efb\u4f55\u952e\u65f6\uff0c\u90fd\u4f1a\u8c03\u7528\u6211\u4eec\u7684\u4fa6\u542c\u5668\uff0c\u5e76\u5c06\u8be5\u952e\u7684\u503c\u548c\u4ee3\u7801\u8bb0\u5f55\u5230\u63a7\u5236\u53f0\u3002\u7ee7\u7eed\u8fd0\u884c\u5b83\uff0c\u770b\u770b\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4ee5\u4e0b\u793a\u4f8b\uff0c\u8be5\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u68c0\u6d4b\u7528\u6237\u662f\u5426\u6309\u4e0b\u4e86 <strong>ctrl + a<\/strong> \u6216 <strong>ctrl + A<\/strong>\u3002<\/p>\n<pre>document.addEventListener('keydown', (event) =&amp;gt; {\n  if (event.ctrlKey) {\n     if (event.keyCode == 65 || event.keyCode == 97) {\n         console.log(\"You have just pressed Ctrl + a\/A!\");\n     }\n  }\n}, false);\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u9996\u5148\uff0c ctrlKey \u662f KeyboardEvent \u5bf9\u8c61\u7684\u4e00\u4e2a\u200b\u200b\u7279\u6b8a\u5c5e\u6027\uff0c\u5b83\u544a\u8bc9\u60a8\u5728\u89e6\u53d1 keydown \u4e8b\u4ef6\u65f6\u662f\u5426\u6309\u4e0b\u4e86 <strong>Ctrl<\/strong> \u952e\u3002\u56e0\u6b64\uff0c\u5982\u679c ctrlKey \u4e3a true\uff0c\u5219\u8868\u793a\u6309\u4e0b\u4e86 <strong>Ctrl<\/strong> \u952e\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u68c0\u67e5\u6309\u4e0b\u7684\u5b57\u7b26\u7684 keyCode \u503c\uff0c\u5982\u679c\u662f 65 \u6216 97\uff0c\u5219\u8868\u793a\u662f <strong>a <\/strong> \u6216 <strong>A<\/strong> \u4e0e <strong>Ctrl<\/strong> \u952e\u4e00\u8d77\u6309\u4e0b\u3002 KeyboardEvent \u5bf9\u8c61\u7684 keyCode \u5c5e\u6027\u8fd4\u56de\u6309\u4e0b\u7684\u952e\u7684 Unicode \u5b57\u7b26\u4ee3\u7801\u3002\u540c\u6837\uff0c\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528 <strong>KeyboardEvent<\/strong> \u5bf9\u8c61\u7684 <strong>shiftKey<\/strong> \u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u544a\u8bc9\u60a8\u5728\u6309\u4e0b\u6309\u952e\u4e8b\u4ef6\u65f6\u662f\u5426\u6309\u4e0b\u4e86 <strong>Shift<\/strong> \u952e\u3002\u89e6\u53d1\u3002<\/p>\n<p>\u6700\u540e\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4ee5\u4e0b\u793a\u4f8b\uff0c\u8be5\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u5728 HTML \u8868\u5355\u7684\u8f93\u5165\u5b57\u6bb5\u4e2d\u4ec5\u5141\u8bb8\u4f7f\u7528\u5b57\u6bcd\u3002<\/p>\n<pre>&lt;script&gt;\nfunction allowOnlyAlphabets(event) {\n  var charCode = event.keyCode;\n\n  if ((charCode &gt; 64 &amp;&amp; charCode &lt; 91) || (charCode &gt; 96 &amp;&amp; charCode &lt; 123))\n    return true;\n  else\n    return false;\n}\n&lt;\/script&gt;&lt;div&gt;\n        &lt;input type=\"text\" onkeydown=\"return allowOnlyAlphabets(event);\"&gt;\n&lt;\/div&gt;\n  \n\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5728\u8f93\u5165\u6587\u672c\u6846\u4e0a\u5b9a\u4e49\u4e86 keydown \u4e8b\u4ef6\u3002\u56e0\u6b64\uff0c\u5f53\u7528\u6237\u5728\u6587\u672c\u6846\u4e2d\u8f93\u5165\u4efb\u4f55\u6587\u672c\u65f6\uff0c\u5b83\u4f1a\u8c03\u7528 allowOnlyAlphabets \u51fd\u6570\u3002\u5728 allowOnlyAlphabets \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u6839\u636e\u5b57\u6bcd\u8868\u7684\u6709\u6548 Unicode \u8303\u56f4\u9a8c\u8bc1\u4e86\u4e8b\u4ef6\u5bf9\u8c61\u7684 keyCode \u5c5e\u6027\u7684\u503c\u3002\u56e0\u6b64\uff0c\u5982\u679c\u7528\u6237\u6309\u4e0b\u6709\u6548\u7684\u5b57\u6bcd\u5b57\u7b26\uff0c\u5219 allowOnlyAlphabets \u51fd\u6570\u5c06\u8fd4\u56de true\uff0c\u5426\u5219\u5c06\u8fd4\u56de false\u3002\u6700\u7ec8\u7ed3\u679c\u662f\u7528\u6237\u5c06\u65e0\u6cd5\u8f93\u5165\u9664\u5b57\u6bcd\u4e4b\u5916\u7684\u4efb\u4f55\u5b57\u7b26\u3002<\/p>\n<h2>keyup \u4e8b\u4ef6<\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u4e86\u89e3 keyup \u4e8b\u4ef6\u5982\u4f55\u5de5\u4f5c\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u4e0e keydown \u4e8b\u4ef6\u975e\u5e38\u76f8\u4f3c\uff0c\u552f\u4e00\u7684\u533a\u522b\u662f\u5b83\u662f\u5728\u91ca\u653e\u6309\u952e\u65f6\u89e6\u53d1\uff0c\u800c\u4e0d\u662f\u5728\u6309\u4e0b\u6309\u952e\u65f6\u89e6\u53d1\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u4f8b\u5b50\u3002<\/p>\n<pre>document.addEventListener('keydown', (event) =&amp;gt; {\n  var keyValue = event.key;\n  var codeValue = event.code;\n\n  console.log(\"keydown event, keyValue: \" + keyValue);\n  console.log(\"keydown event, codeValue: \" + codeValue);\n\n}, false);\n\ndocument.addEventListener('keyup', (event) =&amp;gt; {\n  var keyValue = event.key;\n  var codeValue = event.code;\n\n  console.log(\"keyup event, keyValue: \" + keyValue);\n  console.log(\"keyup event, codeValue: \" + codeValue);\n}, false);\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u5f53\u60a8\u6309\u4e0b\u4efb\u610f\u952e\u65f6\uff0c\u5c06\u9996\u5148\u89e6\u53d1 keydown \u4e8b\u4ef6\uff0c\u7136\u540e\u89e6\u53d1 keyup \u4e8b\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6309 <strong>a<\/strong> \u952e\uff0c\u60a8\u5e94\u8be5\u5728\u63a7\u5236\u53f0\u4e0a\u770b\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002\u8bf7\u52a1\u5fc5\u6ce8\u610f\u4e8b\u4ef6\u7684\u89e6\u53d1\u987a\u5e8f\u3002<\/p>\n<pre>keydown event, keyValue: a\nkeydown event, codeValue: KeyA\nkeyup event, keyValue: a\nkeyup event, codeValue: KeyA\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4ee5\u4e0b\u793a\u4f8b\uff0c\u5b83\u6f14\u793a\u4e86\u5982\u4f55\u5728\u9879\u76ee\u4e2d\u4f7f\u7528 keyup \u4e8b\u4ef6\u3002<\/p>\n<pre>&lt;script&gt;\nfunction getSearchResults(event, element) {\n  if (element.value.length &gt; 6) {\n    var searchKeyword = element.value;\n    \/\/ make an AJAX call to fetch search results for \"searchKeyword\"\n  }\n}\n&lt;\/script&gt;&lt;div&gt;\n           &lt;input type=\"text\" onkeyup=\"return getSearchResults(event, 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