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{"id":25944,"date":"2024-10-27T06:48:41","date_gmt":"2024-10-27T06:48:41","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=25944"},"modified":"2024-11-26T07:49:28","modified_gmt":"2024-11-26T07:49:28","slug":"%eb%a6%ac%ec%95%a1%ed%8a%b8-%ea%b0%95%ec%a2%8c-%ec%8a%a4%ec%bd%94%ed%94%84","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/25944\/","title":{"rendered":"\ub9ac\uc561\ud2b8 \uac15\uc88c: \uc2a4\ucf54\ud504"},"content":{"rendered":"

<\/p>\n

\uc548\ub155\ud558\uc138\uc694! \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8(React)\uc5d0\uc11c\uc758 \uc2a4\ucf54\ud504(Scope)\uc5d0 \ub300\ud574 \uc2ec\ub3c4 \uae4a\uac8c \ub2e4\ub904\ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\ub294 \ud604\ub300 \uc6f9 \uac1c\ubc1c\uc5d0\uc11c \uac00\uc7a5 \uc778\uae30 \uc788\ub294 \ub77c\uc774\ube0c\ub7ec\ub9ac \uc911 \ud558\ub098\ub85c, \ucef4\ud3ec\ub10c\ud2b8 \uae30\ubc18\uc758 \uc544\ud0a4\ud14d\ucc98\ub97c \ud1b5\ud574 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uad6c\ucd95\ud558\uac8c \ub3d5\uc2b5\ub2c8\ub2e4. \uc2a4\ucf54\ud504\ub294 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc758 \uc911\uc694\ud55c \uac1c\ub150 \uc911 \ud558\ub098\ub85c, \ubcc0\uc218\uc758 \uc720\ud6a8 \ubc94\uc704\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ub530\ub77c\uc11c \ub9ac\uc561\ud2b8 \ucef4\ud3ec\ub10c\ud2b8 \ub0b4\uc5d0\uc11c \uc2a4\ucf54\ud504\ub97c \uc774\ud574\ud558\ub294 \uac83\uc740 \ud544\uc218\uc801\uc785\ub2c8\ub2e4.<\/p>\n

1. \uc2a4\ucf54\ud504(Scope)\ub780 \ubb34\uc5c7\uc778\uac00?<\/h2>\n

\uc2a4\ucf54\ud504\ub780 \ud504\ub85c\uadf8\ub7a8 \ub0b4\uc5d0\uc11c \ubcc0\uc218, \ud568\uc218 \ubc0f \uac1d\uccb4\uac00 \uc720\ud6a8\ud55c \ubc94\uc704\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c\ub294 \uc8fc\ub85c \ub450 \uac00\uc9c0 \uc885\ub958\uc758 \uc2a4\ucf54\ud504\uac00 \uc874\uc7ac\ud569\ub2c8\ub2e4: \uc804\uc5ed \uc2a4\ucf54\ud504(Global Scope)\uc640 \uc9c0\uc5ed \uc2a4\ucf54\ud504(Local Scope).<\/p>\n

\uc804\uc5ed \uc2a4\ucf54\ud504<\/strong>\ub294 \ucf54\ub4dc\uc758 \uc5b4\ub5a4 \ubd80\ubd84\uc5d0\uc11c\ub4e0 \uc811\uadfc \uac00\ub2a5\ud55c \ubcc0\uc218\uc758 \ubc94\uc704\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc2a4\ud06c\ub9bd\ud2b8\uc758 \ucd5c\uc0c1\uc704 \ub808\ubca8\uc5d0\uc11c \uc815\uc758\ub41c \ubcc0\uc218\ub294 \uc804\uc5ed \uc2a4\ucf54\ud504\uc5d0 \uc18d\ud569\ub2c8\ub2e4.<\/li>\n

\uc9c0\uc5ed \uc2a4\ucf54\ud504<\/strong>\ub294 \ud2b9\uc815 \ud568\uc218 \ub610\ub294 \ube14\ub85d \ub0b4\uc5d0\uc11c\ub9cc \uc811\uadfc \uac00\ub2a5\ud55c \ubcc0\uc218\uc758 \ubc94\uc704\uc785\ub2c8\ub2e4. \uc774\ub7f0 \ubcc0\uc218\ub4e4\uc740 \ud574\ub2f9 \ud568\uc218 \ub610\ub294 \ube14\ub85d\uc774 \uc2e4\ud589\ub420 \ub54c\ub9cc \uc874\uc7ac\ud558\uac8c \ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n
2. \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \uc2a4\ucf54\ud504\uc758 \uc720\ud615<\/h2>\n
2.1 \uc804\uc5ed \uc2a4\ucf54\ud504<\/h3>\n
\uc804\uc5ed \uc2a4\ucf54\ud504\ub294 \uc2a4\ud06c\ub9bd\ud2b8 \ub0b4\uc5d0\uc11c \uc5b4\ub514\uc11c\ub4e0 \uc811\uadfc\ud560 \uc218 \uc788\ub294 \ubcc0\uc218\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4:<\/p>\n
var globalVar = \"\uc774\uac83\uc740 \uc804\uc5ed \ubcc0\uc218\uc785\ub2c8\ub2e4\";\n\nfunction showGlobalVar() {\n console.log(globalVar);\n}\nshowGlobalVar(); \/\/ \uc774\uac83\uc740 \uc804\uc5ed \ubcc0\uc218\uc785\ub2c8\ub2e4<\/code><\/pre>\n2.2 \ud568\uc218 \uc2a4\ucf54\ud504<\/h3>\n\ud568\uc218 \uc2a4\ucf54\ud504\ub294 \ud568\uc218 \ub0b4\uc5d0\uc11c \uc120\uc5b8\ub41c \ubcc0\uc218\ub4e4\uc774 \ud574\ub2f9 \ud568\uc218 \ub0b4\uc5d0\uc11c\ub9cc \uc720\ud6a8\ud558\ub2e4\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4:<\/p>\n function myFunction() {\n var localVar = \"\uc774\uac83\uc740 \uc9c0\uc5ed \ubcc0\uc218\uc785\ub2c8\ub2e4\";\n console.log(localVar);\n}\n\nmyFunction(); \/\/ \uc774\uac83\uc740 \uc9c0\uc5ed \ubcc0\uc218\uc785\ub2c8\ub2e4\nconsole.log(localVar); \/\/ Uncaught ReferenceError: localVar is not defined<\/code><\/pre>\n2.3 \ube14\ub85d \uc2a4\ucf54\ud504<\/h3>\nES6(ECMAScript 2015)\uc5d0\uc11c \ub3c4\uc785\ub41c \ube14\ub85d \uc2a4\ucf54\ud504\ub294 { } \ube14\ub85d \ub0b4\uc5d0\uc11c\ub9cc \uc720\ud6a8\ud55c \ubcc0\uc218\ub97c \uc815\uc758\ud560 \uc218 \uc788\uac8c \ud574\uc90d\ub2c8\ub2e4. let<\/code> \ub610\ub294 const<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubcc0\uc218\ub97c \uc120\uc5b8\ud558\uba74 \ube14\ub85d \uc2a4\ucf54\ud504\uac00 \uc0dd\uc131\ub429\ub2c8\ub2e4:<\/p>\n if (true) {\n let blockVar = \"\uc774\uac83\uc740 \ube14\ub85d \ubcc0\uc218\uc785\ub2c8\ub2e4\";\n console.log(blockVar); \/\/ \uc774\uac83\uc740 \ube14\ub85d \ubcc0\uc218\uc785\ub2c8\ub2e4\n}\n\nconsole.log(blockVar); \/\/ Uncaught ReferenceError: blockVar is not defined<\/code><\/pre>\n3. \ub9ac\uc561\ud2b8\uc5d0\uc11c\uc758 \uc2a4\ucf54\ud504 \uad00\ub9ac<\/h2>\n\ub9ac\uc561\ud2b8\uc5d0\uc11c \ucef4\ud3ec\ub10c\ud2b8\ub97c \uc791\uc131\ud560 \ub54c, \uc2a4\ucf54\ud504\ub294 \ud2b9\ud788 \uc911\uc694\ud569\ub2c8\ub2e4. \uac01 \ucef4\ud3ec\ub10c\ud2b8\ub294 \uc790\uccb4\uc801\uc73c\ub85c \uc0c1\ud0dc\ub97c \uad00\ub9ac\ud558\uace0, props\ub97c \ud1b5\ud574 \ubd80\ubaa8 \ucef4\ud3ec\ub10c\ud2b8\uc758 \ub370\uc774\ud130\ub97c \ubc1b\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc758 \uc0c1\ud0dc(state)\uc640 props\ub294 \uc2a4\ucf54\ud504\uc758 \uac1c\ub150\uc744 \uba85\ud655\ud788 \uc774\ud574\ud558\ub294 \uac83\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n 3.1 \uc0c1\ud0dc(state)\uc640 \uc2a4\ucf54\ud504<\/h3>\n\ub9ac\uc561\ud2b8 \ucef4\ud3ec\ub10c\ud2b8\uc758 \uc0c1\ud0dc\ub294 \ucef4\ud3ec\ub10c\ud2b8\uac00 \ub80c\ub354\ub9c1\ud560 \ub54c\uc758 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud558\uba70, \uc8fc\ub85c useState<\/code> \ud6c5\uc744 \uc774\uc6a9\ud558\uc5ec \uad00\ub9ac\ud569\ub2c8\ub2e4. \uc0c1\ud0dc\ub294 \ucef4\ud3ec\ub10c\ud2b8 \ub0b4\uc5d0\uc11c\ub9cc \uc811\uadfc\ud560 \uc218 \uc788\ub294 \uc9c0\uc5ed \ubcc0\uc218\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4:<\/p>\n import React, { useState } from 'react';\n\nfunction MyComponent() {\n const [count, setCount] = useState(0);\n\n return (\n \n \ud604\uc7ac \uce74\uc6b4\ud2b8: {count}<\/p>\n