【Japanese】What is "this" in JavaScript.

Transcript

1. +BWB4DSJQUͷzUIJTzͬͯͳΜͩ
2. ٙ໰ͷഎܠ w ҎલΑΓ+BWB4DSJQUʢҎԼKTʣͷUIJT͕Α͘Θ͔Βͳ͔ͬ ͨɻK2VFSZͷ UIJT ͱಉ͡ײ֮Ͱ࢖͏ͱશવػೳ͠ͳ͍
   w Ͱ΋͋·Γ࢖Θͳ͍͔Β์ஔ͍ͯͨ͠ɻ
   w ΦϒδΣΫτࢦ޲ʢҎԼ001ʣͰॻ͖࢝ΊΔͱUIJT͕ొ ৔ɻ·ͨɺ001Ͱهड़͢Δͱ͖Ҏ֎Ͱ΋UIJTΛ࢖͍ͬͯ Δ৔໘Λ໨ܸͨ͜͠ͱ΋͋Δɻ
3. ҎԼΛԡ͓͚͑ͯ͞͹େৎ෉ʁ w ΦϒδΣΫτͷϝιουͷதͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   ఆٛ ͨ͠ΦϒδΣΫτ
   w ؔ਺Ͱ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ
   w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   OFX
   Ͱੜ੒ͨ͠ Πϯελϯε
   w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
   ˠୈҰҾ਺ʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛ୅ೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯ͸ʮछྨʯʁʁ
   ΑΓ
   IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
4. ͦͷલʹɾɾɾ K2VFSZ͔Β৮Γ࢝Ίͨਓ͕צҧ͍ͯ͠͠·͏Ͱ͋Ζ͏ࣄྫΛ঺հ
   ɾ UIJT ͱಉ͡ײ֮ͰUIJTΛ࢖͏ͱ͑Β͍͜ͱʹͳΔɻ
   
5. KTͷ৔߹͸͜͏ॻ͖·͠ΐ͏
6. ҎԼΛԡ͓͚͑ͯ͞͹େৎ෉ʁ w ΦϒδΣΫτͷϝιουͷதͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   ఆ ٛͨ͠ΦϒδΣΫτ
   w ؔ਺Ͱ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ
   w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   OFX
   Ͱੜ੒ͨ͠ Πϯελϯε
   w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
   ˠୈҰҾ਺ʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛ୅ೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯ͸ʮछྨʯʁʁ
   ΑΓ
   IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
7. w ΦϒδΣΫτͷϝιου಺Ͱ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   ఆٛ ͨ͠ΦϒδΣΫτ w ͜ͷ৔߹ɺUIJT͸NZ0CKFDU
   w ࣮ߦ಺༰͸
   DPOTPMFMPH NZ0CKFDUWBMVF ͱಉ͡
8. ҎԼΛԡ͓͚͑ͯ͞͹େৎ෉ʁ w ΦϒδΣΫτͷϝιουͷதͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   ఆٛ ͨ͠ΦϒδΣΫτ
   w ؔ਺Ͱ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ
   w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   OFX
   Ͱੜ੒ͨ͠ Πϯελϯε
   w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
   ˠୈҰҾ਺ʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛ୅ೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯ͸ʮछྨʯʁʁ
   ΑΓ
   IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
9. w ؔ਺Ͱ࢖ΘΕΔ৔߹
   ˠ
   UIJT
   
   άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ w ͜ͷ৔߹ɺUIJT͸άϩʔόϧΦϒδΣΫτʢXJOEPXΦϒ δΣΫτʣ
   w ࣮ߦ಺༰͸
   DPOTPMFMPH XJOEPX 
   ͱಉ͡ɻ͕ग़ྗ͞Ε ΔΘ͚Ͱ͸ͳ͍
10. w ؔ਺Ͱ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ ҎԼͷ৔߹ɺԿ͕ग़ྗ͞ΕΔʁ
11. w ؔ਺Ͱ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ ҎԼͷ৔߹ɺԿ͕ग़ྗ͞ΕΔʁ w ࠷ॳͷDPOTPMFMPH ͸ɺ̎ճ໨ͷDPOTPMFMPH Ͱ͸ VOEFpOFEɻϝιουͷதʹ͋ΔUIJT͕ͩɺؔ਺ݺͼग़͠ ͳͷͰXJOEPXUIJTʢVOEFpOFEʣ͕ݺͼग़͞ΕΔɻ
12. ҎԼΛԡ͓͚͑ͯ͞͹େৎ෉ʁ w ΦϒδΣΫτͷϝιουͷதͰ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    ఆٛ ͨ͠ΦϒδΣΫτ
    w ؔ਺Ͱ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ
    w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    OFX
    Ͱੜ੒ͨ͠ Πϯελϯε
    w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
    ˠୈҰҾ਺ʹUIJTͱ͍ͨ͠Φ ϒδΣΫτΛ୅ೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯ͸ʮछྨʯʁʁ
    ΑΓ
    IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
13. w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    OFX
    Ͱੜ੒͠ ͨΠϯελϯε w .Z0CKFDUͱ͍͏ίϯετϥΫλ͔ΒNZ0CKFDUͱ͍͏Π ϯελϯεΛੜ੒ɻίϯετϥΫλʹ͸UIJT͕ͨ͘͞Μ༻ ͍ΒΕΔɻ
14. ҎԼΛԡ͓͚͑ͯ͞͹େৎ෉ʁ w ΦϒδΣΫτͷϝιουͷதͰ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    ఆٛ ͨ͠ΦϒδΣΫτ
    w ؔ਺Ͱ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    άϩʔόϧΦϒδΣΫτ ʢXJOEPXΦϒδΣΫτʣ
    w ίϯετϥΫλͰ࢖ΘΕΔ৔߹
    ˠ
    UIJT
    
    OFX
    Ͱੜ੒ͨ͠ Πϯελϯε
    w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
    ˠୈҰҾ਺ʹUIJTͱ͍ͨ͠ ΦϒδΣΫτΛ୅ೖ͢Δ ࢀߟɿ+BWB4DSJQUͷʮUIJTʯ͸ʮछྨʯʁʁ
    ΑΓ
    IUUQTRJJUBDPNUBLFIBSVJUFNTDFBEF
15. w BQQMZ΋͘͠͸DBMMΛ࢖͏৔߹
    ˠୈҰҾ਺ʹUIJTͱͨ͠ ͍ΦϒδΣΫτΛ୅ೖ͢Δ w BQQMZͱDBMMϝιουͱ͸ɺຊདྷఆٛ͞Ε͍ͯͳ͍ϝιουΛଞͷΦϒδΣΫτ ͔ΒҰ࣌తʹआΓ͖ͯͯ࢖༻Ͱ͖Δͱ͍͏΋ͷɻ
    w ͜ͷ৔߹͸NZ0CKFDUTIPX ͷUIJT͸NZ0CKFDUͱ͍͏͜ͱʹͳΔ͕ɺBQQMZ΋ ͘͠͸DBMMͷୈҰҾ਺ʹZPVS0CKFDUΛ୅ೖ͢Δ͜ͱͰɺUIJTWBMVF͕ͱͳΔɻ
    w KT͸΄ͱΜͲ͕ΦϒδΣΫτͰఆٛ͞Ε͍ͯΔؔ܎্ɺ༷ʑͳϏϧυΠϯΦϒδΣ ΫτʢBSSBZ EBUF TUSJOH FUDʜʣ͔ΒϝιουΛआΓͯ͘Δ͜ͱ͕Ͱ͖Δɻ