{"id":146,"date":"2016-01-01T12:27:09","date_gmt":"2016-01-01T12:27:09","guid":{"rendered":"http:\/\/sungjin.noip.me\/?p=146"},"modified":"2016-01-01T12:27:09","modified_gmt":"2016-01-01T12:27:09","slug":"javascript%ec%8b%a4%ed%96%89%eb%ac%b8%eb%a7%a5%ea%b3%bc-closure","status":"publish","type":"post","link":"http:\/\/mukgee.com\/?p=146","title":{"rendered":"[javascript]\uc2e4\ud589\ubb38\ub9e5\uacfc closure"},"content":{"rendered":"

\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub97c \uacf5\ubd80\uc911\uc774\ub2e4.<\/p>\n

\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub294 scope \uc5d0 \ub300\ud574 \ub2e4\ub978 \uc5b8\uc5b4\ub4e4\uacfc \ub2e4\ub978 \ud2b9\uc9d5\uc744 \uac00\uc9c0\ub294\ub370<\/p>\n

\uba3c\uc800 \uc720\ud6a8\ubc94\uc704\uc5d0 \uc788\uc5b4\uc11c<\/p>\n

    \n
  1. \ube14\ub7ed \ubc94\uc704\uac00 \uc544\ub2cc \ud568\uc218 \ubc94\uc704\uc774\ub2e4.<\/li>\n
  2. \uc911\ubcf5\ub41c \ubcc0\uc218\uba85\uc758 \uacbd\uc6b0 \ud604\uc7ac \uc2e4\ud589\ubb38\ub9e5\uc758 \ud65c\uc131\ud654 \uac1d\uccb4\uc5d0\uc11c \uba3c\uc800 \ucc3e\ub294\ub2e4.<\/li>\n
  3. \uc720\ud6a8\ubc94\uc704\uac00 \uc2e4\ud589\ud658\uacbd\uc774 \uc544\ub2c8\ub77c \ud568\uc218 \uc815\uc758\ud658\uacbd\uc774\ub2e4<\/li>\n<\/ol>\n

    \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub294 \uc2e4\ud589 \ub420\ub54c \uc2e4\ud589\ubb38\ub9e5\uc744 \uc0dd\uc131\ud574\uc11c \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc758 \ucf5c\uc2a4\ud0dd\uc5d0 \uc313\ub294\ub2e4.<\/p>\n

    \uadf8\ub7fc \uc2e4\ud589\ubb38\ub9e5\uc740 \ubb34\uc5c7\uc77c\uae4c?<\/p>\n

    \uc2e4\ud589 \ubb38\ub9e5\uc740 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ud568\uc218\uac00 \uc2e4\ud589\ub420\ub54c \ud544\uc694\ud55c \uc815\ubcf4\ub4e4\uc744 \ub2f4\uace0 \uc788\ub294 \uac1d\uccb4\ub77c\uace0 \uc0dd\uac01\ud558\uba74 \ub41c\ub2e4. \uc2e4\ud589 \ubb38\ub9e5\uc18d\uc5d0\ub294 \ud65c\uc131\ud654 \uac1d\uccb4(\ubcc0\uc218,\ud568\uc218 \ub4f1\uc758 \uc815\ubcf4), \uc720\ud6a8\ubc94\uc704(chain scope),this \uac1d\uccb4\ub97c \uac00\uc9c4\ub2e4.<\/p>\n

    var o = 100;\nfunction F1(){\n    var a = 10;\n    function F2(){\n        var b = 20;\n        return a+b;\n    }\n    F2();\n}\nF1();<\/pre>\n
    \uc704\uc758 \ucf54\ub4dc\uac00 \uc2e4\ud589 \ub420\ub54c \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub294 \uc804\uc5ed\ucee8\ud0dd\uc2a4\ud2b8\ub97c \uc0dd\uc131\ud558\uc5ec \ucf5c\uc2a4\ud0dd\uc5d0 \uc313\ub294\ub2e4.<\/p>\n
    \uc804\uc5ed \uac1d\uccb4\uc5d0\ub294 o, F1 \uc774 \uc874\uc7ac\ud558\uace0<\/p>\n
    \ub2e4\uc74c\uc73c\ub85c F1() \uc774 \uc2e4\ud589 \ub420\ub54c F1 \uc2e4\ud589 \ucee8\ud0dd\uc2a4\ud2b8\ub97c \ucf5c\uc2a4\ud0dd\uc5d0 \uc313\ub294\ub370<\/p>\n
    \uc774\ub54c \uc2e4\ud589 \ubb38\ub9e5\uc5d0\ub294<\/p>\n
      \n
    1. \ud65c\uc131\ud654\uac1d\uccb4 – a :10 , F2<\/li>\n
    2. scope chain – 0(0\ubc88\uc740 \uc804\uc5ed)<\/li>\n
    3. \uc774 \uc2dc\uc810\uc758 \uc2e4\ud589\ubb38\ub9e5\uc744 this \uc5d0 \ubc14\uc778\ub529 – this.a , this.F2()<\/li>\n<\/ol>\n
      \uadf8\ub9ac\uace0 F1\uc774 \uc2e4\ud589\ub418\uba74\uc11c F2\uac00 \uc2e4\ud589 \ub418\ub294\ub370 \ub2e4\uc2dc \ucf5c\uc2a4\ud0dd\uc5d0 F2\uc758 \uc2e4\ud589 \ubb38\ub9e5\uc774 \uc313\uc774\uace0<\/p>\n
      F2\uc758 \uc2e4\ud589\ubb38\ub9e5\uc740<\/p>\n
        \n
      1. \u00a0\ud65c\uc131\ud654 \uac1d\uccb4<\/li>\n
      2. scope \u00a0chain – 0(\uc804\uc5ed) , 1(F1)<\/li>\n
      3. this<\/li>\n<\/ol>\n
        \ub85c \uad6c\uc131\ub41c\ub2e4.<\/p>\n
        \uc774\ub7f0 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc758 scope\uac00 \uc911\uc694\ud55c \uc774\uc720\ub294 closure\ub77c\ub294 \uac1c\ub150 \ub54c\ubb38\uc778\ub370<\/p>\n
        \uae30\ubcf8\uc801\uc73c\ub85c \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub294 garbage collector\ub97c \uc0ac\uc6a9\ud558\ub294 \uc5b8\uc5b4\uc774\ub2e4.<\/p>\n
        \ub530\ub77c\uc11c \ub354\uc774\uc0c1 \uc0ac\uc6a9(\ucc38\uc870)\ub418\uc9c0 \uc54a\ub294 \ubcc0\uc218\ub294 \uac00\ube44\uc9c0 \uceec\ub809\uc158 \ub300\uc0c1\uc774 \ub418\uc5b4 \uba54\ubaa8\ub9ac\uc5d0\uc11c \ud574\uc81c\ub41c\ub2e4.<\/p>\n
        \ud558\uc9c0\ub9cc closure\ub97c \uc0ac\uc6a9\ud55c\ub2e4\uba74<\/p>\n
        function 1(){<\/p>\n
        function 2(){
        \n}<\/p>\n
        }<\/p>\n
        1\ubc88 \ud568\uc218 \uac00 \uc885\ub8cc \ub41c \ud6c4\uc5d0 2\ubc88 \ud568\uc218\uac00 \uc2e4\ud589 \ub420\ub54c, 1\ubc88 \ud568\uc218\uc758 \ubcc0\uc218\ub97c \ucc38\uace0\ud558\uace0 \uc788\ub2e4\uba74(scope chain \uc5d0 \uc758\ud574 \ud574\ub2f9 \ubcc0\uc218\ub97c \uc0ac\uc6a9 \uac00\ub2a5) 1\ubc88 \ud568\uc218\ub294 \uac00\ube44\uc9c0 \uceec\ub809\uc158 \ub300\uc0c1\uc774 \ub418\uc9c0 \uc54a\ub294\ub2e4. \uacb0\uad6d 2\ubc88 \ud568\uc218\uc758 \uc758\ud574\uc11c 1\ubc88\ud568\uc218\ub294 \ub2eb\ud790\uc218 \uc788\uac8c \ub418\ub294\ub370 \uc774\ub54c 2\ubc88\ud568\uc218\ub294 closure\uac00 \ub41c\ub2e4.<\/p>\n
        \uc774\ub7f0 \uc0c1\ud669\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uba87\uac00\uc9c0 \uc7a5\uc810\uc744 \uac00\uc9c8 \uc218 \uc788\uac8c \ub418\ub294\ub370<\/p>\n
          \n
        1. 1\ubc88\ud568\uc218\uc758 \ubcc0\uc218\ub4e4\uc740 \uc678\ubd80\uc5d0\uc11c \uc811\uae00 \ud560\uc218 \uc788\ub2e4.(\ucea1\uc290\ud654)<\/li>\n
        2. \uac01 \ubcc0\uc218\ub294 \ud574\ub2f9 scope\uc5d0\uc11c\ub9cc \ucc38\uc870 \ub418\ubbc0\ub85c \uc804\uc5ed\ubcc0\uc218\uc758 \ub0a8\uc6a9\uc744 \ub9c9\uc744 \uc218 \uc788\ub2e4.<\/li>\n
        3. \ubcc0\uc218\uc758 \ucda9\ub3cc\uc744 \ub9c9\uc544 \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8 \ubaa8\ub4c8 \ud328\ud134\uc744 \uc0ac\uc6a9\ud560\uc218 \uc788\ub2e4.(\ub77c\uc774\ube0c\ub7ec\ub9ac\ud654)<\/li>\n<\/ol>\n
          \ud558\uc9c0\ub9cc closure\ub294 \ub2e8\uc810\ub3c4 \uc874\uc7ac\ud55c\ub2e4. 1\ubc88\ud568\uc218\uac00 \uac00\ube44\uc9c0 \uceec\ub809\uc158\uc5d0 \uc758\ud574 \uba54\ubaa8\ub9ac\uc5d0\uc11c \ud574\uc81c \ub418\uc5b4\uc57c \ud558\ub098 \uacc4\uc18d \ud574\uc81c \ub418\uc9c0 \ubabb\ud558\uace0 \uc788\uc744 \uacbd\uc6b0 \uc131\ub2a5 \uc800\ud558\uc758 \ubb38\uc81c\uac00 \ub41c\ub2e4. \ub610\ud55c \uc18c\uc2a4 \ub97c \ud30c\uc545\ud558\uae30 \uc5b4\ub835\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
          \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub97c \uacf5\ubd80\uc911\uc774\ub2e4. \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\ub294 scope \uc5d0 \ub300\ud574 \ub2e4\ub978 \uc5b8\uc5b4\ub4e4\uacfc \ub2e4\ub978 \ud2b9\uc9d5\uc744 \uac00\uc9c0\ub294\ub370 \uba3c\uc800 \uc720\ud6a8\ubc94\uc704\uc5d0 \uc788\uc5b4\uc11c \ube14\ub7ed \ubc94\uc704\uac00 \uc544\ub2cc \ud568\uc218 \ubc94\uc704\uc774\ub2e4. \uc911\ubcf5\ub41c \ubcc0\uc218\uba85\uc758 \uacbd\uc6b0 \ud604\uc7ac \uc2e4\ud589\ubb38\ub9e5\uc758 \ud65c\uc131\ud654…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3],"tags":[20],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts\/146"}],"collection":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=146"}],"version-history":[{"count":0,"href":"http:\/\/mukgee.com\/index.php?rest_route=\/wp\/v2\/posts\/146\/revisions"}],"wp:attachment":[{"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=146"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mukgee.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}