{"id":4818,"date":"2023-01-05T10:33:08","date_gmt":"2023-01-05T02:33:08","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4818"},"modified":"2023-01-05T10:33:08","modified_gmt":"2023-01-05T02:33:08","slug":"%e4%ba%86%e8%a7%a3typescript%e5%8f%af%e9%81%b8%e5%8f%83%e6%95%b8%e7%9a%84%e5%a8%81%e5%8a%9b","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e4%ba%86%e8%a7%a3typescript%e5%8f%af%e9%81%b8%e5%8f%83%e6%95%b8%e7%9a%84%e5%a8%81%e5%8a%9b\/","title":{"rendered":"\u4e86\u89e3TypeScript\u53ef\u9078\u53c3\u6578\u7684\u5a01\u529b"},"content":{"rendered":"

<\/p>\n

TypeScript \u53ef\u9009\u53c2\u6570(optional parameter)<\/h1>\n

TypeScript \u662f\u4e00\u7a2e JavaScript \u7684\u8d85\u96c6\uff0c\u5b83\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u985e\u578b\u7cfb\u7d71\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u958b\u767c\u51fa\u53ef\u9760\u7684\u7a0b\u5f0f\u78bc\u3002\u5728 TypeScript \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u53c3\u6578\u4f86\u63d0\u4f9b\u66f4\u591a\u7684\u5f48\u6027\uff0c\u8b93\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u64f4\u5145\u51fd\u5f0f\u7684\u529f\u80fd\u3002<\/p>\n

\u53ef\u9009\u53c3\u6578\u662f\u6307\u5728\u5b9a\u7fa9\u51fd\u5f0f\u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u4e00\u500b\u6216\u591a\u500b\u53c3\u6578\u662f\u53ef\u9078\u7684\uff0c\u4e5f\u5c31\u662f\u8aaa\uff0c\u5728\u8abf\u7528\u51fd\u5f0f\u6642\uff0c\u53ef\u4ee5\u4e0d\u50b3\u5165\u9019\u4e9b\u53c3\u6578\uff0c\u800c\u4e0d\u6703\u5c0e\u81f4\u51fd\u5f0f\u5831\u932f\u3002<\/p>\n

\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u51fd\u5f0f sayHello<\/code>\uff0c\u5b83\u63a5\u53d7\u4e00\u500b\u53c3\u6578 name<\/code>\uff0c\u7528\u65bc\u6307\u5b9a\u8981\u6253\u62db\u547c\u7684\u5c0d\u8c61\uff1a<\/p>\n

function sayHello(name: string) {\n  console.log(`Hello, ${name}!`);\n}\n<\/code><\/pre>\n
\u5982\u679c\u6211\u5011\u60f3\u8981\u7d66 sayHello<\/code> \u589e\u52a0\u4e00\u500b\u53ef\u9078\u53c3\u6578 greeting<\/code>\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
function sayHello(name: string, greeting?: string) {\n  if (greeting) {\n    console.log(`{greeting},<\/span>{name}!`);\n  } else {\n    console.log(`Hello, ${name}!`);\n  }\n}\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 greeting<\/code> \u53c3\u6578\u7684\u578b\u5225\u5b9a\u7fa9\u70ba string<\/code>\uff0c\u4e26\u5728\u53c3\u6578\u540d\u7a31\u5f8c\u9762\u52a0\u4e0a ?<\/code> \u7b26\u865f\uff0c\u8868\u793a\u9019\u500b\u53c3\u6578\u662f\u53ef\u9078\u7684\u3002<\/p>\n
\u73fe\u5728\uff0c\u6211\u5011\u53ef\u4ee5\u8abf\u7528 sayHello<\/code> \u51fd\u5f0f\uff0c\u50b3\u5165\u4e00\u500b\u53c3\u6578 name<\/code>\uff0c\u6216\u8005\u50b3\u5165\u5169\u500b\u53c3\u6578 name<\/code> \u548c greeting<\/code>\uff1a<\/p>\n
sayHello('John'); \/\/ Hello, John!\nsayHello('John', 'Hi'); \/\/ Hi, John!\n<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u8abf\u7528 sayHello<\/code> \u51fd\u5f0f\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u4e0d\u50b3\u5165 greeting<\/code> \u53c3\u6578\uff0c\u800c\u4e0d\u6703\u5c0e\u81f4\u51fd\u5f0f\u5831\u932f\u3002<\/p>\n
\u53e6\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528\u9810\u8a2d\u53c3\u6578\u4f86\u6307\u5b9a\u53ef\u9078\u53c3\u6578\u7684\u9810\u8a2d\u503c\uff0c\u9019\u6a23\u5c31\u53ef\u4ee5\u5728\u8abf\u7528\u51fd\u5f0f\u6642\uff0c\u4e0d\u50b3\u5165\u53c3\u6578\uff0c\u800c\u4f7f\u7528\u9810\u8a2d\u503c\uff1a<\/p>\n
function sayHello(name: string, greeting = 'Hello') {\n  console.log(`{greeting},<\/span>{name}!`);\n}\n\nsayHello('John'); \/\/ Hello, John!\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 greeting<\/code> \u53c3\u6578\u7684\u9810\u8a2d\u503c\u8a2d\u7f6e\u70ba Hello<\/code>\uff0c\u6240\u4ee5\u5728\u8abf\u7528 sayHello<\/code> \u51fd\u5f0f\u6642\uff0c\u53ef\u4ee5\u4e0d\u50b3\u5165 greeting<\/code> \u53c3\u6578\uff0c\u800c\u4f7f\u7528\u9810\u8a2d\u503c Hello<\/code>\u3002<\/p>\n
\u7e3d\u7d50\u4f86\u8aaa\uff0cTypeScript \u63d0\u4f9b\u4e86\u53ef\u9009\u53c3\u6578\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u64f4\u5145\u51fd\u5f0f\u7684\u529f\u80fd\uff0c\u4e26\u63d0\u4f9b\u66f4\u591a\u7684\u5f48\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3TypeScript\u53ef\u9078\u53c3\u6578\u7684\u5a01\u529b\uff0c\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u6709\u6548\u7387\u7684\u958b\u767c\u51fa\u66f4\u597d\u7684\u7a0b\u5f0f\u78bc\uff0c\u8b93\u7a0b\u5f0f\u78bc\u66f4\u52a0\u7c21\u6f54\u3001\u6613\u8b80\uff0c\u4e26\u4e14\u66f4\u5bb9\u6613\u7dad\u8b77\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[187],"tags":[186],"class_list":["post-4818","post","type-post","status-publish","format-standard","hentry","category-typescript","tag-typescript"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1fI","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=4818"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4818\/revisions"}],"predecessor-version":[{"id":4819,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4818\/revisions\/4819"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}