{"id":4920,"date":"2023-01-05T11:18:34","date_gmt":"2023-01-05T03:18:34","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4920"},"modified":"2023-01-05T11:18:34","modified_gmt":"2023-01-05T03:18:34","slug":"%e4%ba%86%e8%a7%a3typescript%e4%b8%ad%e7%9a%84%e9%bb%98%e8%aa%8d%e5%8f%83%e6%95%b8%e5%8a%9f%e8%83%bd-2","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/typescript\/%e4%ba%86%e8%a7%a3typescript%e4%b8%ad%e7%9a%84%e9%bb%98%e8%aa%8d%e5%8f%83%e6%95%b8%e5%8a%9f%e8%83%bd-2\/","title":{"rendered":"\u4e86\u89e3TypeScript\u4e2d\u7684\u9ed8\u8a8d\u53c3\u6578\u529f\u80fd"},"content":{"rendered":"

<\/p>\n

TypeScript \u4e2d\u7684\u9ed8\u8a8d\u53c3\u6578(Default Parameters)<\/h1>\n

TypeScript \u662f\u4e00\u7a2e JavaScript \u7684\u8d85\u96c6\uff0c\u5b83\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u529f\u80fd\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u652f\u6301\u9ed8\u8a8d\u53c3\u6578(Default Parameters)\u3002\u9ed8\u8a8d\u53c3\u6578\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u5b9a\u7fa9\u51fd\u6578\u6642\uff0c\u5c0d\u53c3\u6578\u8a2d\u5b9a\u9810\u8a2d\u503c\uff0c\u7576\u51fd\u6578\u88ab\u8abf\u7528\u6642\uff0c\u5982\u679c\u6c92\u6709\u6307\u5b9a\u53c3\u6578\uff0c\u5c31\u6703\u4f7f\u7528\u9810\u8a2d\u503c\u3002<\/p>\n

<\/p>\n

\u5728 TypeScript \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u9ed8\u8a8d\u53c3\u6578\u4f86\u7c21\u5316\u51fd\u6578\u7684\u5b9a\u7fa9\uff0c\u4e26\u4e14\u53ef\u4ee5\u6e1b\u5c11\u91cd\u8907\u7684\u7a0b\u5f0f\u78bc\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u5b9a\u7fa9\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u63a5\u53d7\u4e00\u500b\u53c3\u6578\uff0c\u4e26\u5c07\u5176\u52a0\u4e0a\u4e00\u500b\u9810\u8a2d\u503c\uff1a<\/p>\n

function add(a: number, b: number = 10): number {\n    return a + b;\n}\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u63a5\u53d7\u5169\u500b\u53c3\u6578\uff0c\u7b2c\u4e8c\u500b\u53c3\u6578\u7684\u9810\u8a2d\u503c\u70ba 10\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6211\u5011\u8abf\u7528\u8a72\u51fd\u6578\u6642\uff0c\u53ea\u50b3\u5165\u4e00\u500b\u53c3\u6578\uff0c\u5247\u7b2c\u4e8c\u500b\u53c3\u6578\u5c07\u4f7f\u7528\u9810\u8a2d\u503c 10\uff1a<\/p>\n
let result = add(5);\nconsole.log(result); \/\/ 15\n<\/code><\/pre>\n
\u53e6\u5916\uff0c\u6211\u5011\u4e5f\u53ef\u4ee5\u5c07\u9ed8\u8a8d\u53c3\u6578\u8207\u53ef\u9078\u53c3\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n
function add(a: number, b?: number): number {\n    if (b === undefined) {\n        b = 10;\n    }\n    return a + b;\n}\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u63a5\u53d7\u5169\u500b\u53c3\u6578\uff0c\u7b2c\u4e8c\u500b\u53c3\u6578\u662f\u53ef\u9078\u7684\uff0c\u5982\u679c\u6c92\u6709\u6307\u5b9a\u7b2c\u4e8c\u500b\u53c3\u6578\uff0c\u5247\u5c07\u4f7f\u7528\u9810\u8a2d\u503c 10\u3002<\/p>\n
\u7e3d\u7d50\u4f86\u8aaa\uff0cTypeScript \u4e2d\u7684\u9ed8\u8a8d\u53c3\u6578\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u5b9a\u7fa9\u51fd\u6578\u6642\uff0c\u5c0d\u53c3\u6578\u8a2d\u5b9a\u9810\u8a2d\u503c\uff0c\u7576\u51fd\u6578\u88ab\u8abf\u7528\u6642\uff0c\u5982\u679c\u6c92\u6709\u6307\u5b9a\u53c3\u6578\uff0c\u5c31\u6703\u4f7f\u7528\u9810\u8a2d\u503c\uff0c\u9019\u6a23\u53ef\u4ee5\u7c21\u5316\u51fd\u6578\u7684\u5b9a\u7fa9\uff0c\u4e26\u6e1b\u5c11\u91cd\u8907\u7684\u7a0b\u5f0f\u78bc\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981:TypeScript\u4e2d\u7684\u9ed8\u8a8d\u53c3\u6578\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5728\u51fd\u6578\u5b9a\u7fa9\u6642\u6307\u5b9a\u53c3\u6578\u7684\u9ed8\u8a8d\u503c\uff0c\u8b93\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u7387\u7684\u5b8c\u6210\u7a0b\u5f0f\u958b\u767c\uff0c\u672c\u6587\u5c07\u4ecb\u7d39TypeScript\u4e2d\u7684\u9ed8\u8a8d\u53c3\u6578\u529f\u80fd\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-4920","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\/pcFK27-1hm","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4920","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=4920"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4920\/revisions"}],"predecessor-version":[{"id":4921,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4920\/revisions\/4921"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}