\n| \u5904\u7406 false<\/td>\n | \u4fdd\u7559\u5e03\u5c14\u503c<\/td>\n | \u8986\u76d6\u4e3a\u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u4e8c\u3001\u590d\u6742\u573a\u666f\u4e0b\u7684\u7a7a\u503c\u5904\u7406<\/h3>\n<\/p>\n1\u3001\u6df1\u5c42\u5d4c\u5957\u5bf9\u8c61\u7684\u9ed8\u8ba4\u503c<\/h4>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ed3\u5408\u53ef\u9009\u94fe\u64cd\u4f5c\u7b26（?.），\u53ef\u4ee5\u5b89\u5168\u5730\u5904\u7406\u591a\u5c42\u5d4c\u5957\u5bf9\u8c61\u7684\u5c5e\u6027\u8bbf\u95ee\u3002<\/p>\n const config = {
\n api: {
\n v1: {
\n endpoint: ''
\n }
\n }
\n};<\/p>\n \/\/ \u4f20\u7edf\u5199\u6cd5（\u9700\u8981\u9010\u5c42\u5224\u65ad）
\nconst endpoint = config.api?.v1?.endpoint || 'default';<\/p>\n \/\/ \u4f7f\u7528??\u7684\u6539\u8fdb\u5199\u6cd5
\nconst endpoint = config.api?.v1?.endpoint ?? 'default'; <\/p>\n 2\u3001\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u9677\u9631<\/h4>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5f53\u51fd\u6570\u53c2\u6570\u9700\u8981\u63a5\u6536\u5e03\u5c14\u503c\u65f6，\u4f7f\u7528??\u53ef\u4ee5\u907f\u514d\u610f\u5916\u8986\u76d6\u7528\u6237\u4f20\u5165\u7684false\u503c\u3002<\/p>\n function createPost(data) {
\n \/\/ \u9519\u8bef\u5199\u6cd5：\u4f1a\u8986\u76d6\u6709\u6548\u5e03\u5c14\u503c
\n const isPublic = data.isPublic || true;<\/p>\n \/\/ \u6b63\u786e\u5199\u6cd5：\u4ec5\u5904\u7406null\/undefined
\n const isPublic = data.isPublic ?? true;
\n} <\/p>\n 3\u3001\u591a\u6761\u4ef6\u56de\u9000\u7b56\u7565<\/h4>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u901a\u8fc7\u94fe\u5f0f\u4f7f\u7528??，\u53ef\u4ee5\u5b9e\u73b0\u591a\u5c42\u7ea7\u7684\u914d\u7f6e\u56de\u9000\u673a\u5236，\u8fd9\u79cd\u6a21\u5f0f\u5728\u8bfb\u53d6\u73af\u5883\u53d8\u91cf\u65f6\u7279\u522b\u5b9e\u7528\u3002<\/p>\n const theme = userConfig.theme
\n ?? systemConfig.theme
\n ?? process.env.THEME
\n ?? 'light'; <\/p>\n \u4e09\u3001\u5b9e\u6218\u6848\u4f8b\u89e3\u6790<\/h3>\n<\/p>\n1\u3001Vue\u7ec4\u4ef6\u4e2d\u7684Prop\u5904\u7406<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 \u5982\u679cdisabled\u63a5\u6536\u7684\u503c\u4e3afalse，\u5982\u679c\u4f7f\u7528\u903b\u8f91\u6216\u64cd\u4f5c\u7b26，\u5c31\u4f1a\u88ab\u8ba4\u4e3a\u662f\u65e0\u6548\u503c，\u4ece\u800c\u4f7f\u7528\u9ed8\u8ba4\u7684true\u503c\u3002\u5982\u679c\u4f7f\u7528\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u3002<\/p>\n <template>
\n <input :disabled="isDisabled" \/>
\n<\/template><\/p>\n <script>
\nexport default {
\n props: {
\n disabled: {
\n type: Boolean,
\n default: undefined
\n }
\n },
\n computed: {
\n isDisabled() {
\n return this.disabled ?? true;
\n }
\n }
\n}
\n<\/script> <\/p>\n 2\u3001\u8868\u5355\u9a8c\u8bc1<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 \u5c31\u7b97\u4f60\u4e0d\u5141\u8bb8\u7528\u6237\u8f93\u5165\u7a7a\u683c，\u8d77\u7801\u8981\u5141\u8bb8\u7528\u6237\u8f93\u51650\u548c\u5f15\u53f7\u5427？\u5982\u679c\u4f7f\u7528\u903b\u8f91\u6216\u64cd\u4f5c\u7b26，\u6839\u672c\u65e0\u6cd5\u901a\u8fc7\u8868\u5355\u9a8c\u8bc1，\u4f7f\u7528\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u3002<\/p>\n function validateForm(formData) {
\n const errors = [];<\/p>\n if (formData.username?.trim() ?? false) {
\n errors.push('\u7528\u6237\u540d\u4e0d\u80fd\u4e3a\u7a7a');
\n }<\/p>\n if (formData.age ?? false) {
\n errors.push('\u5e74\u9f84\u5fc5\u987b\u586b\u5199');
\n }<\/p>\n return errors;
\n} <\/p>\n \u56db\u3001\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\u7684\u6027\u80fd\u4f18\u52bf<\/h3>\n<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5b9e\u9645\u6d4b\u8bd5\u663e\u793a，??\u5728\u6027\u80fd\u4e0a\u4e0e||\u57fa\u672c\u6301\u5e73，\u4f46\u5728\u5904\u7406\u590d\u6742\u5bf9\u8c61\u65f6\u66f4\u5177\u4f18\u52bf\u3002\u8fd9\u662f\u56e0\u4e3a\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\u53ea\u68c0\u67e5null\u548cundefined，\u6bd4||\u64cd\u4f5c\u7b26\u7684\u7c7b\u578b\u8f6c\u6362\u64cd\u4f5c\u66f4\u9ad8\u6548\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u5f53\u7136，\u8fd9\u90e8\u5206\u5dee\u5f02\u5f88\u5c0f，\u66f4\u591a\u7684\u4f5c\u7528\u662f\u5c55\u793a\u5f00\u53d1\u8005\u7684\u601d\u7ef4\u80fd\u529b\u3002<\/p>\n \/\/ \u6d4b\u8bd5\u73af\u5883：Chrome 112，100\u4e07\u6b21\u8fd0\u7b97
\nconsole.time('||');
\nfor (let i = 0; i < 1000000; i++) null || 10;
\nconsole.timeEnd('||'); \/\/ 2.1ms<\/p>\n console.time('??');
\nfor (let i = 0; i < 1000000; i++) null ?? 10;
\nconsole.timeEnd('??'); \/\/ 1.8ms <\/p>\n \u4e94\u3001\u7ed3\u8bed<\/h3>\n<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26（??）\u8fd9\u4e2a\u770b\u4f3c\u7b80\u5355\u7684\u8bed\u6cd5\u7cd6，\u5b9e\u5219\u8574\u542b\u7740\u63d0\u5347\u4ee3\u7801\u5065\u58ee\u6027\u7684\u5f3a\u5927\u80fd\u529b\u3002\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u5efa\u8bae\u7ed3\u5408TypeScript\u7684\u4e25\u683c\u7a7a\u503c\u68c0\u67e5，\u6784\u5efa\u66f4\u53ef\u9760\u7684\u7c7b\u578b\u5b89\u5168\u4f53\u7cfb\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u53ea\u6709\u953b\u70bc\u601d\u7ef4\u624d\u80fd\u53ef\u6301\u7eed\u5730\u89e3\u51b3\u95ee\u9898，\u53ea\u6709\u601d\u7ef4\u624d\u662f\u771f\u6b63\u503c\u5f97\u5b66\u4e60\u548c\u5206\u4eab\u7684\u6838\u5fc3\u8981\u7d20\u3002\u5982\u679c\u8fd9\u7bc7\u535a\u5ba2\u80fd\u7ed9\u60a8\u5e26\u6765\u4e00\u70b9\u5e2e\u52a9，\u9ebb\u70e6\u60a8\u70b9\u4e2a\u8d5e\u652f\u6301\u4e00\u4e0b，\u8fd8\u53ef\u4ee5\u6536\u85cf\u8d77\u6765\u4ee5\u5907\u4e0d\u65f6\u4e4b\u9700，\u6709\u7591\u95ee\u548c\u9519\u8bef\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u6307\u51fa~<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5176\u4ed6\u70ed\u95e8\u6587\u7ae0，\u8bf7\u5173\u6ce8：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u6781\u81f4\u7684\u7075\u6d3b\u5ea6\u6ee1\u8db3\u5de5\u7a0b\u7f8e\u5b66：\u7528Vue Flow\u7ed8\u5236\u4e00\u4e2a\u5b8c\u7f8e\u6d41\u7a0b\u56fe<\/p>\n \u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0\u4f60\u771f\u7684\u4f1a\u4f7f\u7528Vue3\u7684onMounted\u94a9\u5b50\u51fd\u6570\u5417？Vue3\u4e2donMounted\u7684\u7528\u6cd5\u8be6\u89e3<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0DeepSeek：\u5168\u6808\u5f00\u53d1\u8005\u89c6\u89d2\u4e0b\u7684AI\u9769\u547d\u8005<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0\u901a\u8fc7array.filter()\u5b9e\u73b0\u6570\u7ec4\u7684\u6570\u636e\u7b5b\u9009\u3001\u6570\u636e\u6e05\u6d17\u548c\u94fe\u5f0f\u8c03\u7528<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0\u901a\u8fc7Array.sort() \u5b9e\u73b0\u591a\u5b57\u6bb5\u6392\u5e8f\u3001\u6392\u5e8f\u7a33\u5b9a\u6027\u3001\u968f\u673a\u6392\u5e8f\u6d17\u724c\u7b97\u6cd5\u3001\u4f18\u5316\u6392\u5e8f\u6027\u80fd<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0TreeSize：\u514d\u8d39\u7684\u78c1\u76d8\u6e05\u7406\u4e0e\u7ba1\u7406\u795e\u5668，\u89e3\u51b3C\u76d8\u7206\u6ee1\u7684\u71c3\u7709\u4e4b\u6025<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0\u901a\u8fc7MongoDB Atlas \u5b9e\u73b0\u8bed\u4e49\u641c\u7d22\u4e0e RAG\u2014\u2014\u8fc8\u5411AI\u7684\u641c\u7d22\u673a\u5236<\/p>\n \u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0\u6df1\u5165\u7406\u89e3 JavaScript \u4e2d\u7684 Array.find() \u65b9\u6cd5：\u539f\u7406\u3001\u6027\u80fd\u4f18\u52bf\u4e0e\u5b9e\u7528\u6848\u4f8b\u8be6\u89e3<\/p>\n \u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0el-table\u5b9e\u73b0\u52a8\u6001\u6570\u636e\u7684\u5b9e\u65f6\u6392\u5e8f，\u4e00\u7bc7\u6587\u7ae0\u8bb2\u6e05\u695aelementui\u7684\u8868\u683c\u6392\u5e8f\u529f\u80fd<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0MutationObserver\u8be6\u89e3+\u6848\u4f8b\u2014\u2014\u6df1\u5165\u7406\u89e3 JavaScript \u4e2d\u7684 MutationObserver<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0JavaScript\u4e2d\u901a\u8fc7array.map(）\u5b9e\u73b0\u6570\u636e\u8f6c\u6362\u3001\u521b\u5efa\u6d3e\u751f\u6570\u7ec4\u3001\u5f02\u6b65\u6570\u636e\u6d41\u5904\u7406\u3001DOM\u64cd\u4f5c\u7b49<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u9ad8\u6548\u5de5\u4f5c\u6d41：\u7528Mermaid\u7ed8\u5236\u4f60\u7684\u4e13\u5c5e\u6d41\u7a0b\u56fe；\u5982\u4f55\u5728Vue3\u4e2d\u5bfc\u5165mermaid\u7ed8\u5236\u6d41\u7a0b\u56fe<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0Dockerfile\u5168\u9762\u6307\u5357：\u4ece\u57fa\u7840\u5230\u8fdb\u9636，\u638c\u63e1\u5bb9\u5668\u5316\u6784\u5efa\u7684\u6838\u5fc3\u5de5\u5177<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u7ebf\u7f16\u7a0b\u5b9e\u73b0！\u5982\u4f55\u5728Java\u540e\u7aef\u901a\u8fc7DockerClient\u64cd\u4f5cDocker\u751f\u6210python\u73af\u5883<\/p>\n \u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0\u5e72\u8d27\u542b\u6e90\u7801！\u5982\u4f55\u7528Java\u540e\u7aef\u64cd\u4f5cDocker（\u547d\u4ee4\u884c\u7bc7）<\/p>\n","protected":false},"excerpt":{"rendered":" \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb6k\u6b21\uff0c\u70b9\u8d5e175\u6b21\uff0c\u6536\u85cf99\u6b21\u3002\u5904\u7406\u53d8\u91cf\u9ed8\u8ba4\u503c\u662f\u4e00\u4e2a\u5e38\u89c1\u4f46\u5bb9\u6613\u5f15\u53d1bug\u7684\u64cd\u4f5c\u3002\u5f88\u591a\u5f00\u53d1\u8005\u53ef\u80fd\u90fd\u9047\u5230\u8fc7\u8fd9\u6837\u7684\u95ee\u9898\uff1a\u4f7f\u7528||\u8bbe\u7f6e\u9ed8\u8ba4\u503c\u65f6\uff0c\u610f\u5916\u8986\u76d6\u4e860\u3001\\’\\’\u7b49\u5408\u6cd5\u503c\u3002\u8fd9\u65f6\u5019\uff0cES2020\u5f15\u5165\u7684\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\uff08??\uff09\u5c31\u80fd\u5b8c\u7f8e\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u3002_javascript ??<\/p>\n","protected":false},"author":2,"featured_media":33782,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2820,722,2340,567,187,568,87,190],"topic":[],"class_list":["post-33784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-javascriptamptypescript","tag-ecmascript","tag-es6","tag-html","tag-javascript","tag-typescript","tag-87","tag-190"],"yoast_head":"\n JavaScript\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\uff08??\uff09\u8be6\u89e3\uff0c\u89e3\u51b3\u4f7f\u7528 || \u65f6\u56e0\u7c7b\u578b\u8f6c\u6362\u5e26\u6765\u7684\u95ee\u9898 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/33784.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript\u53cc\u95ee\u53f7\u64cd\u4f5c\u7b26\uff08??\uff09\u8be6\u89e3\uff0c\u89e3\u51b3\u4f7f\u7528 || \u65f6\u56e0\u7c7b\u578b\u8f6c\u6362\u5e26\u6765\u7684\u95ee\u9898 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" 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