{"id":1256,"date":"2022-06-05T09:56:48","date_gmt":"2022-06-05T01:56:48","guid":{"rendered":"http:\/\/zhuxinyong.com\/?p=1256"},"modified":"2023-02-16T14:43:53","modified_gmt":"2023-02-16T06:43:53","slug":"29-hui-diao-han-shu-he-hui-diao-de-yu","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=1256","title":{"rendered":"29 – \u56de\u8c03\u51fd\u6570\u548c\u56de\u8c03\u5730\u72f1"},"content":{"rendered":"

\"\"<\/p>\n

\u539f\u6587\u5730\u5740\uff1ahttps:\/\/dev.to\/bhagatparwinder\/callback-functions-callback-hell-79n<\/a><\/p>\n

\u5728\u4e4b\u524d\u6211\u4eec\u8ba8\u8bba\u4e8b\u4ef6\u5904\u7406\u5668\u65f6\u5df2\u7ecf\u63a5\u89e6\u4e86\u4e00\u4e9b\u56de\u8c03\u51fd\u6570\u7684\u6982\u5ff5\uff0c\u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u5c06\u6df1\u5165\u7684\u63a2\u7a76\u56de\u8c03\u51fd\u6570\u4ee5\u53ca\u5b83\u4eec\u662f\u5982\u4f55\u89e3\u51b3\u5f02\u6b65\u7f16\u7a0b\uff0c\u8fd8\u6709\u5b83\u4eec\u7684\u7f3a\u70b9\u4ee5\u53ca\u4ec0\u4e48\u662f\u56de\u8c03\u5730\u72f1\u3002<\/p>\n

\u56de\u8c03\u51fd\u6570\u662f\u88ab\u5f53\u505a\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u5b83\u51fd\u6570\u7684\u51fd\u6570\uff0c\u56de\u8c03\u51fd\u6570\u53ef\u4ee5\u5728\u88ab\u8c03\u7528\u7684\u51fd\u6570\u5185\u6267\u884c\u4e00\u4e9b\u4efb\u52a1\u3002<\/p>\n

function greeting(name) {\n    console.log(`Hello ${name}`);\n}\n\nfunction getUserName(callback) {\n    const name = prompt("Enter your name");\n    callback(name);\n}\n\ngetUserName(greeting);\n<\/code><\/pre>\n
\u8fd9\u4e2a\u4f8b\u5b50\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f<\/p>\n
    \n
  1. getUserName<\/code> \u4f20\u5165\u4e00\u4e2a\u53c2\u6570\u88ab\u8c03\u7528\uff0c\u53c2\u6570\u662f greet<\/code> \u51fd\u6570\uff1b<\/li>\n
  2. getUserName<\/code> \u8ba9\u7528\u6237\u8f93\u5165\u7528\u6237\u540d\u4e14\u4fdd\u5b58\u5230\u53d8\u91cf name<\/code> \u4e2d\uff1b<\/li>\n
  3. getUserName<\/code> \u8c03\u7528\u56de\u8c03\u51fd\u6570\u4e14\u4f20\u5165 name<\/code> \u4f5c\u4e3a\u53c2\u6570\uff1b<\/li>\n
  4. \u6211\u4eec\u53ef\u4ee5\u628a\u53c2\u6570\u547d\u540d\u4e3a\u4efb\u4f55\u53d8\u91cf\u540d\uff0c\u800c\u4e0d\u4e00\u5b9a\u8981\u662f callback;<\/li>\n
  5. \u56de\u8c03\u51fd\u6570\uff08geeting<\/code>\uff09\u4f20\u5165\u53c2\u6570 name<\/code> \u6267\u884c\u4e14\u6253\u5370\u51fa "Hello name"\u3002<\/li>\n<\/ol>\n
    \u4ee5\u4e0a\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u56de\u8c03\u51fd\u6570\u7684\u4f8b\u5b50\uff0c\u5177\u4f53\u6765\u8bf4\u5b83\u662f\u540c\u6b65\u56de\u8c03\u3002\u4e00\u5207\u90fd\u88ab\u9010\u884c\u6267\u884c\uff0c\u4e00\u4e2a\u63a5\u4e00\u4e2a\u3002<\/p>\n
    <\/span><\/a>\u540c\u6b65\u548c\u5f02\u6b65<\/h2>\n
    \u6ce8\u610f\uff1aJavaScript \u662f\u5355\u7ebf\u7a0b\u8bed\u8a00\uff0c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u4ee3\u7801\u3002<\/p>\n
    \u5176\u4ed6\u8bed\u8a00\u53ef\u4ee5\u540c\u65f6\u542f\u52a8\u591a\u4e2a\u7ebf\u7a0b\u548c\u6267\u884c\u591a\u4e2a\u8fdb\u7a0b\uff0c\u4f46\u662f JavaScript \u4e0d\u884c\u3002\u5f53\u6267\u884c\u8017\u65f6\u64cd\u4f5c\u4f8b\u5982\u78c1\u76d8 I\/O \u6216\u662f\u7f51\u7edc\u8bf7\u6c42\u65f6\u8fd9\u53ef\u80fd\u4f1a\u662f\u4e00\u4e2a\u660e\u663e\u7684\u7f3a\u70b9\u3002<\/p>\n
    \u56e0\u4e3a\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u6267\u884c\u4e00\u4ef6\u4e8b\uff0c\u7528\u6237\u5fc5\u987b\u7b49\u5230\u8017\u65f6\u8f83\u957f\u7684\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\u624d\u80fd\u8fdb\u4e00\u6b65\u6267\u884c\u540e\u7eed\u7684\u52a8\u4f5c\u3002<\/p>\n
    JavaScript \u7684 \u4e8b\u4ef6\u5faa\u73af\u3001\u56de\u8c03\u6808\u3001\u56de\u8c03\u961f\u5217\u4ee5\u53ca web \u63a5\u53e3\u7ec4\u6210\u4e86\u5b83\u7684\u5f02\u6b65\u3002<\/p>\n
      \n
    1. JavaScript \u7ef4\u62a4\u4e86\u4e00\u4e2a\u6808\u6765\u6267\u884c\u4efb\u52a1\uff1b<\/li>\n
    2. \u53ef\u80fd\u9700\u8981\u66f4\u591a\u65f6\u95f4\u7684\u52a8\u4f5c\u88ab\u59d4\u6258\u7ed9\u7f51\u7edcAPI\uff1b<\/li>\n
    3. \u4e00\u65e6\u8d39\u65f6\u7684\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u5b83\u4f1a\u88ab\u6dfb\u52a0\u5230\u6267\u884c\u961f\u5217\u4e2d\uff1b<\/li>\n
    4. \u53ea\u8981\u6808\u4e2d\u6ca1\u6709\u4efb\u52a1\u53ef\u4ee5\u6267\u884c\uff0cJavaScript \u5f15\u64ce\u5c31\u4f1a\u4ece\u961f\u5217\u4e2d\u53d6\u51fa\u4e00\u4e2a\u7136\u540e\u653e\u5230\u6808\u4e2d\u6267\u884c\u3002<\/li>\n<\/ol>\n
      <\/span><\/a>\u56de\u8c03\u5982\u4f55\u63a8\u52a8\u5f02\u6b65\u7f16\u7a0b\u7684<\/h2>\n
      \u6709\u8bb8\u591a\u8017\u65f6\u4efb\u52a1\u50cf\u78c1\u76d8 I\/O\u3001\u7f51\u7edc\u8bf7\u6c42\u548c\u6570\u636e\u5904\u7406\uff0c\u8fd9\u4e9b\u9700\u8981\u653e\u5230\u5f02\u6b65\u4e2d\u53bb\u6267\u884c\u3002\u6211\u4eec\u53ef\u4ee5\u4e3e\u4e00\u4e9b\u76f4\u89c2\u7684\u4f8b\u5b50\u6765\u89e3\u91ca\u8bf4\u660e\uff1a<\/p>\n
      console.log("Hello");\nconsole.log("Hey");\nconsole.log("Namaste");\n<\/code><\/pre>\n
      \u5f53\u6267\u884c\u4e0a\u9762\u4ee3\u7801\u540e\uff0c\u63a7\u5236\u53f0\u6253\u5370\u5982\u4e0b\uff1aHello Hey Namaste<\/code>\uff0c\u8fd9\u662f\u6b63\u786e\u7684\u6267\u884c\u987a\u5e8f\u3002\u73b0\u5728\u6211\u4eec\u6765\u5f15\u5165setTimeout<\/code> \u6765\u5305\u88f9 "Hey"\uff0c\u671f\u671b\u7b49\u5f85 2 \u79d2\u540e\u6253\u5370 "Hey"\u3002<\/p>\n
      console.log("Hello");\n\nsetTimeout(() => {\n    console.log("Hey");\n}, 2000);\n\nconsole.log("Namaste");\n<\/code><\/pre>\n
      \u4ee4\u6211\u4eec\u60ca\u5947\u7684\u662f\uff0c\u5b83\u6253\u5370\u5982\u4e0b\uff1a"Hello Namaste Hey"\uff0c\u671f\u671b\u7684\u662f\u5148\u6253\u5370"Hello"\uff0c\u7b49\u5f85 2 \u79d2\u540e\u6253\u5370 "Hey"\uff0c\u6700\u540e\u6253\u5370 "Namaste"\u3002<\/p>\n
        \n
      1. \u56de\u8c03\u51fd\u6570\u4f20\u9012\u7ed9 setTimeout \u7136\u540e\u7b49\u5f85 2 \u79d2\u540e\u6267\u884c\uff1b<\/li>\n
      2. JavaScript \u4e0d\u662f\u963b\u585e\u7b49\u5f85 2 \u79d2\u800c\u6839\u636e\u4e8b\u4ef6\u5faa\u73af\u539f\u7406\u628a\u5b83\u59d4\u6258\u7ed9 web api\uff1b<\/li>\n
      3. web api \u7b49\u5f85 2 \u79d2\u540e\u628a\u5b83\u79fb\u5230\u56de\u8c03\u961f\u5217\u4e2d\uff1b<\/li>\n
      4. \u540c\u65f6\u6700\u540e\u4e00\u4e2a console \u6253\u5370\u6267\u884c\uff1b<\/li>\n
      5. \u4e00\u65e6\u6808\u4e2d\u6ca1\u6709\u4ec0\u4e48\u53ef\u4ee5\u6267\u884c\u7684\uff0csetTimeout \u5c31\u4f1a\u88ab\u4ece\u961f\u5217\u4e2d\u79fb\u52a8\u5230\u6808\u4e2d\u5e76\u6267\u884c\u3002<\/li>\n<\/ol>\n
        \u53ca\u65f6 setTimeout \u662f\u7b49\u5f85 0 \u79d2\uff0c\u6253\u5370\u7684\u987a\u5e8f\u4f9d\u65e7\u662f "Hello Namaste Hey"\u3002\u5947\u602a\u7684\u662f 0 \u79d2\u5e94\u8be5\u662f\u7acb\u5373\u6267\u884c\uff0c\u53ef\u4e8b\u5b9e\u4e0a\u5e76\u975e\u5982\u6b64\u3002\u5b83\u4f9d\u65e7\u4f1a\u50cf\u4e0a\u9762\u63d0\u5230\u7684\u4ee3\u7801\u4e00\u6837\u7ecf\u5386\u4e8b\u4ef6\u5faa\u73af\u3002\u6267\u884c\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
        console.log("Hello");\n\nsetTimeout(() => {\n    console.log("Hey");\n}, 0);\n\nconsole.log("Namaste");\n<\/code><\/pre>\n
        <\/span><\/a>\u56de\u8c03\u51fd\u6570\u7684\u7f3a\u70b9\u4ee5\u53ca\u56de\u8c03\u5730\u72f1<\/h2>\n
        \u968f\u7740\u6211\u4eec\u6709\u66f4\u597d\u7684\u65b9\u6cd5\u6765\u89e3\u51b3\u5f02\u6b65\u64cd\u4f5c\uff0c\u56de\u8c03\u51fd\u6570\u5219\u53d8\u5f97\u8d8a\u6765\u8d8a\u4ee4\u4eba\u8ba8\u538c\uff0c\u5176\u5b9e\u6211\u4eec\u6ca1\u6709\u5fc5\u8981\u8fd9\u6837\u5bf9\u56de\u8c03\u51fd\u6570\u6709\u654c\u610f\u3002\u5f53\u6211\u4eec\u53ea\u6709 1-2 \u4e2a\u5f02\u6b65\u64cd\u4f5c\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u8fd8\u662f\u5f88\u597d\u7528\u7684\u3002<\/p>\n
        \u5f53\u6211\u4eec\u9700\u8981\u5904\u7406\u591a\u4f59 2 \u4e2a\u5f02\u6b65\u4efb\u52a1\u94fe\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u5219\u663e\u5f97\u6349\u895f\u89c1\u8098\uff0c\u8ba9\u6211\u4eec\u4ece\u4f8b\u5b50\u6765\u4e86\u89e3\u4e00\u4e0b\u3002<\/p>\n
        \u6211\u4eec\u5047\u8bbe\u5e0c\u671b\u6bcf\u95f4\u9694 2 \u79d2\u6253\u5370\u8f93\u51fa\u95ee\u5019\u8bed\uff0c\u8f93\u51fa\u5982\u4e0b\uff1aHello Hey Namaste Hi Bonjour<\/code>\u3002<\/p>\n
        setTimeout(() => {\n    console.log("Hello");\n    setTimeout(() => {\n        console.log("Hey");\n        setTimeout(() => {\n            console.log("Namaste");\n            setTimeout(() => {\n                console.log("Hi");\n                setTimeout(() => {\n                    console.log("Bonjour");\n                }, 2000);\n            }, 2000);\n        }, 2000);\n    }, 2000);\n}, 2000);\n<\/code><\/pre>\n
        \u8fd9\u79cd\u7ea7\u8054\u5d4c\u5957\u7684\u4ee3\u7801\u79f0\u4e3a\u56de\u8c03\u5730\u72f1\uff0c\u5f88\u96be\u8c03\u8bd5\u4e5f\u5f88\u96be\u6355\u83b7\u9519\u8bef\uff0c\u540c\u6837\u964d\u4f4e\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n
        \u5728\u6700\u540e\u6211\u4eec\u4f1a\u7559\u4e00\u5f20\u56fe\uff0c\u7528\u4e8e\u5728\u4ee5\u540e\u7684\u65e5\u5b50\u91cc\u65f6\u523b\u63d0\u9192\u5927\u5bb6\u5173\u4e8e\u56de\u8c03\u5730\u72f1\u3002\u540e\u9762\u7684\u6587\u7ae0\u6211\u4eec\u5c06\u8c08\u8bba\u5176\u4f59\u7684\u5f02\u6b65\u65b9\u6cd5\uff1apromise \u3001 async\/await \u548c observables\u3002<\/p>\n
        \"\"<\/p>\n
        \"\u524d\u7aef\u9ed1\u677f\u62a5\"<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u539f\u6587\u5730\u5740\uff1ahttps:\/\/dev.to\/bhagatparwinder\/callback-funct...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249,2,20,3],"tags":[138,139,135],"class_list":["post-1256","post","type-post","status-publish","format-standard","hentry","category-javascript","category-all","category-frontend","category-tech","tag-callback","tag-hell","tag-js-parwinder"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1256"}],"version-history":[{"count":1,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1256\/revisions"}],"predecessor-version":[{"id":1257,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1256\/revisions\/1257"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}