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【Japanese】What is "this" in JavaScript.
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readalpha
August 30, 2020
Programming
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26
【Japanese】What is "this" in JavaScript.
readalpha
August 30, 2020
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Transcript
+BWB4DSJQUͷzUIJTzͬͯͳΜͩ
ٙͷഎܠ w ҎલΑΓ+BWB4DSJQUʢҎԼKTʣͷUIJT͕Α͘Θ͔Βͳ͔ͬ ͨɻK2VFSZͷ UIJT ͱಉ͡ײ֮Ͱ͏ͱશવػೳ͠ͳ͍ w Ͱ͋·ΓΘͳ͍͔Β์ஔ͍ͯͨ͠ɻ w ΦϒδΣΫτࢦʢҎԼ001ʣͰॻ͖࢝ΊΔͱUIJT͕ొ
ɻ·ͨɺ001Ͱهड़͢Δͱ͖Ҏ֎ͰUIJTΛ͍ͬͯ Δ໘Λܸͨ͜͠ͱ͋Δɻ
ҎԼΛԡ͓͚͑ͯ͞େৎʁ w ΦϒδΣΫτͷϝιουͷதͰΘΕΔ߹ˠUIJTఆٛ ͨ͠ΦϒδΣΫτ w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜͨ͠ Πϯελϯε
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯʮछྨʯʁʁΑΓ IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
ͦͷલʹɾɾɾ K2VFSZ͔Β৮Γ࢝Ίͨਓ͕צҧ͍ͯ͠͠·͏Ͱ͋Ζ͏ࣄྫΛհ ɾ UIJT ͱಉ͡ײ֮ͰUIJTΛ͏ͱ͑Β͍͜ͱʹͳΔɻ
KTͷ߹͜͏ॻ͖·͠ΐ͏
ҎԼΛԡ͓͚͑ͯ͞େৎʁ w ΦϒδΣΫτͷϝιουͷதͰΘΕΔ߹ˠUIJTఆ ٛͨ͠ΦϒδΣΫτ w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜͨ͠ Πϯελϯε
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯʮछྨʯʁʁΑΓ IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
w ΦϒδΣΫτͷϝιουͰΘΕΔ߹ˠUIJTఆٛ ͨ͠ΦϒδΣΫτ w ͜ͷ߹ɺUIJTNZ0CKFDU w ࣮ߦ༰DPOTPMFMPH NZ0CKFDUWBMVF ͱಉ͡
ҎԼΛԡ͓͚͑ͯ͞େৎʁ w ΦϒδΣΫτͷϝιουͷதͰΘΕΔ߹ˠUIJTఆٛ ͨ͠ΦϒδΣΫτ w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜͨ͠ Πϯελϯε
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯʮछྨʯʁʁΑΓ IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ͜ͷ߹ɺUIJTάϩʔόϧΦϒδΣΫτʢXJOEPXΦϒ δΣΫτʣ w ࣮ߦ༰DPOTPMFMPH XJOEPX ͱಉ͡ɻ͕ग़ྗ͞Ε
ΔΘ͚Ͱͳ͍
w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ ҎԼͷ߹ɺԿ͕ग़ྗ͞ΕΔʁ
w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ ҎԼͷ߹ɺԿ͕ग़ྗ͞ΕΔʁ w ࠷ॳͷDPOTPMFMPH ɺ̎ճͷDPOTPMFMPH Ͱ VOEFpOFEɻϝιουͷதʹ͋ΔUIJT͕ͩɺؔݺͼग़͠ ͳͷͰXJOEPXUIJTʢVOEFpOFEʣ͕ݺͼग़͞ΕΔɻ
ҎԼΛԡ͓͚͑ͯ͞େৎʁ w ΦϒδΣΫτͷϝιουͷதͰΘΕΔ߹ˠUIJTఆٛ ͨ͠ΦϒδΣΫτ w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜͨ͠ Πϯελϯε
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯʮछྨʯʁʁΑΓ IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜ͠ ͨΠϯελϯε w .Z0CKFDUͱ͍͏ίϯετϥΫλ͔ΒNZ0CKFDUͱ͍͏Π ϯελϯεΛੜɻίϯετϥΫλʹUIJT͕ͨ͘͞Μ༻ ͍ΒΕΔɻ
ҎԼΛԡ͓͚͑ͯ͞େৎʁ w ΦϒδΣΫτͷϝιουͷதͰΘΕΔ߹ˠUIJTఆٛ ͨ͠ΦϒδΣΫτ w ؔͰΘΕΔ߹ˠUIJTάϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ίϯετϥΫλͰΘΕΔ߹ˠUIJTOFXͰੜͨ͠ Πϯελϯε
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱ͍ͨ͠ ΦϒδΣΫτΛೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯʮछྨʯʁʁΑΓ IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
w BQQMZ͘͠DBMMΛ͏߹ˠୈҰҾʹUIJTͱͨ͠ ͍ΦϒδΣΫτΛೖ͢Δ w BQQMZͱDBMMϝιουͱɺຊདྷఆٛ͞Ε͍ͯͳ͍ϝιουΛଞͷΦϒδΣΫτ ͔ΒҰ࣌తʹआΓ͖ͯͯ༻Ͱ͖Δͱ͍͏ͷɻ w ͜ͷ߹NZ0CKFDUTIPX ͷUIJTNZ0CKFDUͱ͍͏͜ͱʹͳΔ͕ɺBQQMZ ͘͠DBMMͷୈҰҾʹZPVS0CKFDUΛೖ͢Δ͜ͱͰɺUIJTWBMVF͕ͱͳΔɻ
w KT΄ͱΜͲ͕ΦϒδΣΫτͰఆٛ͞Ε͍ͯΔ্ؔɺ༷ʑͳϏϧυΠϯΦϒδΣ ΫτʢBSSBZ EBUF TUSJOH FUDʜʣ͔ΒϝιουΛआΓͯ͘Δ͜ͱ͕Ͱ͖Δɻ