{"id":85067,"date":"2023-11-06T05:54:00","date_gmt":"2023-11-06T05:54:00","guid":{"rendered":"https:\/\/abbyhsia.com\/?p=85067"},"modified":"2025-04-15T11:14:55","modified_gmt":"2025-04-15T11:14:55","slug":"note-function-hoisting-javascript","status":"publish","type":"post","link":"https:\/\/abbyhsia.com\/index.php\/2023\/11\/06\/note-function-hoisting-javascript\/","title":{"rendered":"[Note]Function Hoisting – JavaScript"},"content":{"rendered":"\r\n

Cover Credit to Slidin squares loader<\/a><\/p>\r\n\r\n\r\n\r\n

\u9032\u5165\u51fd\u6578\u63d0\u5347(function Hoisting)\u4ecb\u7d39\u4e4b\u524d\uff0c\u5148\u8a8d\u8b58Javascript \u7684\u63d0\u5347(Hoisting)\u6982\u5ff5\u662f\u4ec0\u9ebc\u3002<\/p>\r\n\r\n\r\n\r\n

Hoisting in Javascript<\/h2>\r\n\r\n\r\n\r\n

Javascript\u9032\u5165\u8b80\u53d6\u7a0b\u5f0f\u78bc\u4e4b\u524d\uff0c\u6703\u5148\u7de8\u8b6f\u57f7\u884c\u7684\u7a0b\u5f0f\u78bc\u3002<\/p>\r\n\r\n\r\n\r\n

\u6bd4\u55bb\u4f86\u8aaa\uff0c\u5c0fA\u5e73\u5e38\u6709\u8490\u96c6\u98df\u8b5c\u7fd2\u6163\uff0c\u8981\u53bb\u63a1\u8cb7\u5099\u6599\u7684\u524d\u4e00\u665a\uff0c\u6703\u5148\u7ffb\u4e00\u4e0b\u98df\u8b5c\uff0c\u624d\u77e5\u9053\u660e\u65e9\u53bb\u83dc\u5e02\u5834\u5148\u7d93\u904e\u7b2c\u4e00\u5bb6\u8089\u6524\u3001\u7b2c\u4e8c\u5bb6\u83dc\u6524\u8981\u8cb7\u4ec0\u9ebc\u3002<\/p>\r\n\r\n\r\n

\r\n
\"\"<\/figure><\/div>\r\n\r\n\r\n

\u547c\u61c9\u958b\u982d\u63d0\u53caJS Hoisting\u89c0\u5ff5\u300c\u5148\u6e96\u5099\u5728\u8b80\u53d6\u300d\uff0c\u800c\u8b80\u53d6\u65b9\u5f0f\u6703\u4f9d\u64daJS\u904b\u884c\u51fd\u6578\u548c\u8b8a\u6578\u5169\u8005\u4e0d\u540c\u898f\u5247\u4f86\u8655\u7406\uff0c\u4ee5\u4e0a\u5716\u70ba\u4f8b\uff0c\u53ef\u4ee5\u60f3\u50cf\u5c0fA\u5148\u95b1\u8b80\u98df\u8b5c\uff0c\u5728\u5df2\u77e5\u83dc\u5e02\u5834\u6524\u8ca9\u52d5\u7dda\u53bb\u8cb7\u83dc\uff0c\u63d0\u524d\u64ec\u5b9a\u8cfc\u7269\u8a08\u756b\uff0c
\u5982\u540c\u5728JS\u8b80\u7a0b\u5f0f\u78bc\u4e4b\u524d\uff0c\u5df2\u6709\u65e2\u5b9a\u5b58\u53d6\u7a0b\u5f0f\u78bc\u65b9\u5f0f\u4f86\u5224\u65b7\u5982\u4f55\u9032\u884cHoisting\u3002<\/p>\r\n\r\n\r\n\r\n

\u51fd\u6578Functions<\/h2>\r\n\r\n\r\n\r\n

\u51fd\u6578\u8868\u8ff0\u5f0f(Function Expression)<\/h3>\r\n\r\n\r\n\r\n

\u5728\u8b8a\u6578\u4e2d\u8ce6\u503c\u51fd\u5f0f\uff0c\u8abf\u7528\u5f8c\u6210\u529f\u53d6\u503c\u3002\u4ee5\u4e0b\u65b9\u8209\u4f8b\uff0c\u51fd\u5f0f\u8072\u660e(Function Declaration)\u662f\u88abvar\u5b9a\u7fa9\u3002<\/p>\r\n\r\n\r\n\r\n

JavaScript<\/span><\/span>\r\n
var<\/span> meat<\/span>=function<\/span> beef<\/span>(){<\/span><\/span>\r\n console.<\/span>log<\/span>(<\/span>'\u5403\u500boec\u725b\u8089\u9eb5\u5427'<\/span>);<\/span><\/span>\r\n}<\/span><\/span>\r\nbeef<\/span>():<\/span><\/span>\r\n\/\/Output:\u5403\u500boec\u725b\u8089\u9eb5\u5427<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n
\u51fd\u6578\u9673\u8ff0\u5f0f(Function Statement)<\/h3>\r\n\r\n\r\n\r\n
\u5c07\u8b8a\u6578\u5ba3\u544a\u5beb\u5165\u51fd\u5f0f\u8072\u660e\u4e2d\uff0c\u5728\u5916\u90e8\u547c\u53eb\u51fd\u5f0f\u53ef\u4ee5\u53d6\u503c\u3002<\/p>\r\n\r\n\r\n\r\n
JavaScript<\/span><\/span>\r\n
function<\/span> beefnoodle<\/span>(){<\/span><\/span>\r\n\tvar<\/span> meat<\/span>=<\/span>'beef'<\/span>;<\/span><\/span>\r\n\tconsole.<\/span>log<\/span>(<\/span>'\u71d2\u71d9\u71d9'<\/span>+<\/span>meat);<\/span><\/span>\r\n}<\/span><\/span>\r\nbeefnoodle<\/span>();<\/span><\/span>\r\n\/\/Output:\u71d2\u71d9\u71d9beef<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n
\u51fd\u5f0f\u9673\u8ff0\u5f0f\u5e38\u898b\u65bc\u57f7\u884c\u6307\u4ee4\uff0c\u4e0d\u540c\u65bc\u51fd\u5f0f\u8868\u8ff0\u5f0f\u6703\u662f\u7531\u51fd\u6578\u4e4b\u5916\u7684\u8b8a\u6578\u5e36\u9032\u51fd\u6578\uff0c\u5728\u7d93\u904e\u8a08\u7b97\u8fd4\u503c\u3002<\/p>\r\n\r\n\r\n\r\n
\u63a5\u4e0b\u4f86\uff0c\u5ef6\u4f38\u4e0a\u8ff0\u4f8b\u5b50\u5f80\u4e0b\u770bHoisting\u3002<\/strong><\/p>\r\n\r\n\r\n\r\n
\u51fd\u6578Hoisting<\/h2>\r\n\r\n\r\n\r\n
\u6211\u5011\u53ef\u4ee5\u900f\u904e\u5169\u7a2e\u51fd\u5f0f\u5beb\u6cd5\u66b8\u89e3\u63d0\u5347(Hoist)\u6982\u5ff5\u3002<\/p>\r\n\r\n\r\n\r\n
\u8868\u8ff0\u5f0fHoisting<\/h3>\r\n\r\n\r\n\r\n
\u51fd\u5f0f\u8868\u8ff0\u5f0f\u662f\u7531\u8b8a\u6578\u5e36\u9032\u51fd\u5f0f\u8ce6\u4e88\u503c\uff0c\u5728\u547c\u53eb\u51fd\u5f0f\u53d6\u5f97\u8a08\u7b97\u7d50\u679c\uff0c\u51fd\u6578\u7684\u8868\u8ff0\u5f0f\u5728\u7b2c\u56db\u884c\u51fd\u6578\u4e4b\u5f8c\u624d\u6703\u88ab\u57f7\u884c\uff0c<\/p>\r\n\r\n\r\n\r\n
\u5982\u679c\u547c\u53eb\u5beb\u5728\u7b2c\u56db\u884c\u4e4b\u524d\uff0c\u5728\u7b2c\u4e00\u884c\u547c\u53eb\u6703\u5f97\u5230undefined\u7d50\u679c\u3002<\/p>\r\n\r\n\r\n\r\n
JavaScript<\/span><\/span>\r\n
beef<\/span>():<\/span><\/span>\r\n\/\/Uncaught TypeError: undefined is not a function.<\/span><\/span>\r\n\r\nvar<\/span> beef<\/span>=function<\/span> (){<\/span><\/span>\r\n console.<\/span>log<\/span>(<\/span>'\u5403\u500boec\u725b\u8089\u9eb5\u5427'<\/span>);<\/span><\/span>\r\n}<\/span><\/span>\r\nbeef<\/span>();<\/span><\/span>\r\n\/\/Output:\u5403\u500boec\u725b\u8089\u9eb5\u5427<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n
\u9673\u8ff0\u5f0fHoisting<\/h3>\r\n\r\n\r\n\r\n
\u4e0d\u540c\u65bc\u8868\u8ff0\u5f0f(Function Statement)\uff0c\u8b8a\u6578\u5ba3\u544a\u5beb\u5728\u51fd\u5f0f\u4e2d\uff0c\u53ef\u4ee5\u5728\u51fd\u5f0f\u4e4b\u524d\u88ab\u8abf\u7528\uff0c \u547c\u61c9\u958b\u982d\u63d0\u53ca\u9019\u8ddfJS\u548c\u700f\u89bd\u5668\u63d0\u524d\u6e96\u5099\u8b80\u53d6\u6709\u95dc\uff0c\u51fd\u5f0f\u8abf\u7528\u6703\u88ab\u79fb\u81f3\u51fd\u5f0f\u4e4b\u524d\u56e0\u6b64\u53ef\u6210\u529f\u53d6\u503c\u3002<\/p>\r\n\r\n\r\n\r\n
JavaScript<\/span><\/span>\r\n
cooking<\/span>();<\/span><\/span>\r\nfunction<\/span> cooking<\/span>(){<\/span><\/span>\r\n\tvar<\/span> beef<\/span>=<\/span>'\u725b\u8089'<\/span>;<\/span><\/span>\r\n\tvar<\/span> tomato<\/span>=<\/span>'\u756a\u8304'<\/span>;<\/span><\/span>\r\n\tconsole.<\/span>log<\/span>(<\/span>'\u6709'<\/span>+<\/span>tomato<\/span>+<\/span>'\u7684'<\/span>+<\/span>beef<\/span>+<\/span>'\u9eb5\u771f4oec'<\/span>);<\/span><\/span>\r\n}<\/span><\/span>\r\n\/\/Output:\u6709\u756a\u8304\u7684\u725b\u8089\u9eb5\u771f4oec<\/span><\/span>\r\n\r\n\r\nfunction<\/span> cooking<\/span>(){<\/span><\/span>\r\n\tvar<\/span> beef<\/span>=<\/span>'\u725b\u8089'<\/span>;<\/span><\/span>\r\n\tvar<\/span> tomato<\/span>=<\/span>'\u756a\u8304'<\/span>;<\/span><\/span>\r\n\tconsole.<\/span>log<\/span>(<\/span>'\u6709'<\/span>+<\/span>tomato<\/span>+<\/span>'\u7684'<\/span>+<\/span>beef<\/span>+<\/span>'\u9eb5\u771f4oec'<\/span>);<\/span><\/span>\r\n}<\/span><\/span>\r\ncooking<\/span>();<\/span><\/span>\r\n\/\/Output:\u6709\u756a\u8304\u7684\u725b\u8089\u9eb5\u771f4oec<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n
\u51fd\u5f0f\u9673\u8ff0\u5f0f\u5728JS Hoisting\u6703\u88ab\u7f6e\u9802\u5230\u4f5c\u7528\u57df\uff0c \u800c\u8868\u8ff0\u5f0f\u662f\u7531\u8b8a\u6578\u4f86\u5b9a\u7fa9\u51fd\u793a\u53d6\u7d50\u679c\uff0c\u9700\u8981\u7b49\u8dd1\u5b8c\u8868\u8ff0\u5f0f\u5f8c\u547c\u53eb\u624d\u6703\u8fd4\u503c\uff0c\u6545\u547c\u53eb\u61c9\u653e\u5728\u51fd\u5f0f\u5f8c\u65b9\u3002<\/p>\r\n\r\n\r\n\r\n
 <\/p>\r\n\r\n\r\n\r\n
\u5076\u723e\u6703\u756b\u5716\u4f86\u7406\u89e3\u7a0b\u5f0f\u78bc\uff0c\u82e5\u5167\u6587\u5716\u50cf\u5c0d\u4f60\u7406\u89e3\u6709\u5e6b\u52a9\uff0c\u6b61\u8fce\u81ea\u884c\u53d6\u7528\u3002<\/strong><\/p>\r\n\r\n\r\n\r\n
\u6b64\u70ba\u7d00\u9304\u5b78\u7fd2\u904e\u7a0b\uff0c\u5982\u5167\u5bb9\u6709\u8aa4\uff0c\u6b61\u8fce\u7559\u8a00\u6307\u6559\u3002<\/strong><\/p>\r\n","protected":false},"excerpt":{"rendered":"
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