{"id":14927,"date":"2024-08-01T01:02:10","date_gmt":"2024-07-31T17:02:10","guid":{"rendered":"https:\/\/fgchen.com\/wpedu\/?p=14927"},"modified":"2026-03-30T14:29:57","modified_gmt":"2026-03-30T06:29:57","slug":"javascript%e7%9a%84arrow-function%ef%bc%88%e5%bf%ab%e7%ae%ad%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/fgchen.com\/wpedu\/2024\/08\/javascript%e7%9a%84arrow-function%ef%bc%88%e5%bf%ab%e7%ae%ad%e5%87%bd%e6%95%b8\/","title":{"rendered":"JavaScript\u7684Arrow Function\uff08\u5feb\u7bad\u51fd\u6578)"},"content":{"rendered":"

JavaScript\u7684Arrow Function\uff08\u7bad\u982d\u51fd\u6578\uff09\u662fES6\u5f15\u5165\u7684\u4e00\u7a2e\u65b0\u7684\u51fd\u6578\u8868\u9054\u5f0f\uff0c\u5177\u6709\u7c21\u6f54\u7684\u8a9e\u6cd5\u548c\u7279\u5b9a\u7684\u7279\u6027\u3002\u5b83\u5011\u8207\u50b3\u7d71\u7684\u51fd\u6578\u8072\u660e\u4e0d\u540c\uff0c\u4e3b\u8981\u7528\u65bc\u7c21\u5316\u51fd\u6578\u7684\u5beb\u6cd5\uff0c\u4e26\u4e14\u5728\u8655\u7406this<\/code>\u95dc\u9375\u5b57\u65b9\u9762\u6709\u4e00\u4e9b\u7368\u7279\u7684\u884c\u70ba\u3002<\/p>\n

\u57fa\u672c\u8a9e\u6cd5<\/h3>\n

\u7bad\u982d\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

(param1, param2, \u2026, paramN) => { statements }<\/code><\/pre>\n
\u5982\u679c\u51fd\u6578\u53ea\u6709\u4e00\u500b\u53c3\u6578\uff0c\u53ef\u4ee5\u7701\u7565\u5713\u62ec\u865f\uff1a<\/p>\n
singleParam => { statements }<\/code><\/pre>\n
\u5982\u679c\u51fd\u6578\u9ad4\u53ea\u6709\u4e00\u500b\u8868\u9054\u5f0f\uff0c\u4e14\u9700\u8981\u8fd4\u56de\u503c\uff0c\u53ef\u4ee5\u7701\u7565\u5927\u62ec\u865f\u548creturn<\/code>\u95dc\u9375\u5b57\uff1a<\/p>\n
(param1, param2, \u2026, paramN) => expression<\/code><\/pre>\n
\u5404\u578b\u614b\u7684\u7528\u9014\u8207\u4f8b\u5b50<\/h3>\n
1. \u7121\u53c3\u6578\u7684\u7bad\u982d\u51fd\u6578<\/h4>\n
\u7576\u51fd\u6578\u4e0d\u9700\u8981\u4efb\u4f55\u53c3\u6578\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u62ec\u865f\uff1a<\/p>\n
const sayHello = () => console.log('Hello');\nsayHello(); \/\/ \u8f38\u51fa: Hello<\/code><\/pre>\n
2. \u55ae\u53c3\u6578\u7684\u7bad\u982d\u51fd\u6578<\/h4>\n
\u7576\u51fd\u6578\u53ea\u6709\u4e00\u500b\u53c3\u6578\u6642\uff0c\u53ef\u4ee5\u7701\u7565\u5713\u62ec\u865f\uff1a<\/p>\n
const square = x => x * x;\nconsole.log(square(5)); \/\/ \u8f38\u51fa: 25<\/code><\/pre>\n
3. \u591a\u53c3\u6578\u7684\u7bad\u982d\u51fd\u6578<\/h4>\n
\u7576\u51fd\u6578\u6709\u591a\u500b\u53c3\u6578\u6642\uff0c\u9700\u8981\u4f7f\u7528\u5713\u62ec\u865f\uff1a<\/p>\n
const add = (a, b) => a + b;\nconsole.log(add(3, 4)); \/\/ \u8f38\u51fa: 7<\/code><\/pre>\n
4. \u5e36\u6709\u51fd\u6578\u9ad4\u7684\u7bad\u982d\u51fd\u6578<\/h4>\n
\u7576\u51fd\u6578\u9ad4\u5167\u6709\u591a\u884c\u4ee3\u78bc\u6642\uff0c\u9700\u8981\u4f7f\u7528\u5927\u62ec\u865f\u5305\u88f9\uff0c\u4e26\u986f\u5f0f\u4f7f\u7528return<\/code>\u4f86\u8fd4\u56de\u503c\uff1a<\/p>\n
const multiply = (a, b) => {\n    const result = a * b;\n    return result;\n};\nconsole.log(multiply(3, 4)); \/\/ \u8f38\u51fa: 12<\/code><\/pre>\n
5. \u8fd4\u56de\u5c0d\u8c61\u5b57\u9762\u91cf\u7684\u7bad\u982d\u51fd\u6578<\/h4>\n
\u7576\u7bad\u982d\u51fd\u6578\u9700\u8981\u8fd4\u56de\u4e00\u500b\u5c0d\u8c61\u5b57\u9762\u91cf\u6642\uff0c\u5c0d\u8c61\u9700\u8981\u7528\u62ec\u865f\u5305\u8d77\u4f86\uff0c\u5426\u5247\u6703\u88ab\u7576\u4f5c\u51fd\u6578\u9ad4\u7684\u62ec\u865f\uff1a<\/p>\n
const getUser = (name, age) => ({ name: name, age: age });\nconsole.log(getUser('Alice', 30)); \/\/ \u8f38\u51fa: { name: 'Alice', age: 30 }<\/code><\/pre>\n
6. \u5167\u5d4c\u7bad\u982d\u51fd\u6578\uff08\u9ad8\u968e\u51fd\u6578\uff09<\/h4>\n
\u7bad\u982d\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u9ad8\u968e\u51fd\u6578\uff0c\u5982\u9663\u5217\u7684\u65b9\u6cd5\uff1a<\/p>\n
const numbers = [1, 2, 3, 4, 5];\nconst doubled = numbers.map(n => n * 2);\nconsole.log(doubled); \/\/ \u8f38\u51fa: [2, 4, 6, 8, 10]<\/code><\/pre>\n
\u7279\u6027\u8207\u9650\u5236<\/h3>\n
    \n
  1. this<\/code>\u7d81\u5b9a<\/strong>\uff1a\u7bad\u982d\u51fd\u6578\u4e0d\u6703\u5275\u5efa\u81ea\u5df1\u7684this<\/code>\u4e0a\u4e0b\u6587\uff0c\u5b83\u5011\u6703\u6355\u7372\u5c01\u9589\u7bc4\u570d\u5167\u7684this<\/code>\u503c\u4f5c\u70ba\u81ea\u5df1\u7684this<\/code>\u503c\u3002\u56e0\u6b64\uff0c\u7bad\u982d\u51fd\u6578\u9069\u5408\u7528\u5728\u9700\u8981\u4fdd\u6301this<\/code>\u4e0a\u4e0b\u6587\u7684\u56de\u8abf\u4e2d\u3002<\/li>\n<\/ol>\n
    function Person() {\n    this.age = 0;\n\n    setInterval(() => {\n        this.age++; \/\/ `this`\u6b63\u78ba\u6307\u5411Person\u5c0d\u8c61\n        console.log(this.age);\n    }, 1000);\n}\n\nconst p = new Person();<\/code><\/pre>\n
      \n
    1. \u4e0d\u80fd\u7528\u4f5c\u69cb\u9020\u51fd\u6578<\/strong>\uff1a\u7bad\u982d\u51fd\u6578\u4e0d\u80fd\u7528\u4f5c\u69cb\u9020\u51fd\u6578\uff08\u4f7f\u7528new<\/code>\u904b\u7b97\u7b26\uff09\uff0c\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<\/ol>\n
      const Foo = () => {};\nconst foo = new Foo(); \/\/ TypeError: Foo is not a constructor<\/code><\/pre>\n
        \n
      1. \u6c92\u6709arguments<\/code>\u5c0d\u8c61<\/strong>\uff1a\u7bad\u982d\u51fd\u6578\u6c92\u6709\u81ea\u5df1\u7684arguments<\/code>\u5c0d\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528\u5269\u9918\u53c3\u6578\u4f86\u4ee3\u66ff\u3002<\/li>\n<\/ol>\n
        const sum = (...args) => args.reduce((acc, val) => acc + val, 0);\nconsole.log(sum(1, 2, 3, 4)); \/\/ \u8f38\u51fa: 10<\/code><\/pre>\n
        \u7d50\u8ad6<\/h3>\n
        JavaScript\u7684\u7bad\u982d\u51fd\u6578\u4ee5\u5176\u7c21\u6f54\u7684\u8a9e\u6cd5\u548c\u7279\u5b9a\u7684\u7279\u6027\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7de8\u5beb\u51fd\u6578\u7684\u65b0\u65b9\u5f0f\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u56de\u8abf\u548c\u4fdd\u6301this<\/code>\u4e0a\u4e0b\u6587\u6642\u975e\u5e38\u6709\u7528\u3002\u7136\u800c\uff0c\u7531\u65bc\u5b83\u5011\u7684\u7279\u6027\u8207\u9650\u5236\uff0c\u4f7f\u7528\u6642\u9700\u8981\u8b39\u614e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        JavaScript\u7684Arrow Function\uff08\u7bad\u982d\u51fd\u6578\uff09\u662fES6\u5f15\u5165\u7684\u4e00\u7a2e … <\/p>\n","protected":false},"author":1,"featured_media":14759,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[266],"tags":[],"class_list":["post-14927","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-266"],"_links":{"self":[{"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/posts\/14927","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/comments?post=14927"}],"version-history":[{"count":1,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/posts\/14927\/revisions"}],"predecessor-version":[{"id":14928,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/posts\/14927\/revisions\/14928"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/media\/14759"}],"wp:attachment":[{"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/media?parent=14927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/categories?post=14927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fgchen.com\/wpedu\/wp-json\/wp\/v2\/tags?post=14927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}