Reactハンズオン 01 入門編 コード部分抜粋 / React Handson 01 components (excerpt)
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Shunsuke Watanabe
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)FMMP8PSMEίϯϙʔωϯτ࡞ • TSDDPNQPOFOUT)FMMP8PSMEKTΛ࡞ͯ͠։͘
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w ϒϥβ͕ࣗಈͰϦϩʔυ͞Εɺ)FMMP8PSME͕දࣔ͞ΕΔ w TSD"QQKTΛ։͘ w )FMMP8PSMEKTΛΠϯϙʔτ w SFOEFSϝιουʹ )FMMP8PSME ΛՃͯ͠อଘ
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ϓϩύςΟͷड͚͠ λάʹଐੑΛ͢͜ͱͰɺλάͰQSPQTϓϩύςΟΛ௨ͯͦ͡ͷ ʹΞΫηεͰ͖ΔΑ͏ʹͳΔ 1. "QQKTͰͷݺͼग़͠Λมߋ 2. )FMMP8PSMEKTͰQSPQTϓϩύςΟΛ௨ͯ͡HSFFUJOHΛࢀর͢Δ 3. "QQKTͰͷݺͼग़͠Λมߋ 4. λάͷࢠཁૉɺQSPQTDIJMESFOͰࢀরͰ͖Δ
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&4PCKFDUEFTUSVDUVSJOH ͬͯΈΑ͏ 1.QSPQTΛड͚औ͍ͬͯͨͱ͜ΖΛɺ\HSFFUJOH^ʹมߋͯ͠ΈΔ 2.HSFFUJOHͱผʹɺUPଐੑΛ͠ɺʮੈքʯΛஔ͖͑ͯΈΔ
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ελΠϧఆٛ )FMMP8PSMEίϯϙʔωϯτͷจࣈ৭Λม͑ͯΈΔ 1. ελΠϧఆٛ 2. ελΠϧద༻
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TFU4UBUFΛͬͨ؆қεςʔτཧ 1. "QQKTʹDPOTUSVDUPSϝιουΛՃͯ͠ϩʔΧϧεςʔτΛ ॳظԽ
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εςʔτΛࢀরͯ͠ίϯϙʔωϯτʹ͢ • ͬͯΈΑ͏ • constructorͰઃఆͨ͠ॳظΛมߋͯ͠ΈΔ
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ΠϕϯτͰεςʔτΛॻ͖͑Δ εςʔτߋ৽༻ϝιουΛՃ DPOTUSVDUPSͰΫϥεΠϯελϯεΛCJOE
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SFOEFSϝιουʹϘλϯՃ ΠϕϯτͰεςʔτΛॻ͖͑Δ • ͬͯΈΑ͏ • stateͷঢ়ଶʹΑͬͯഎܠ৭Λมߋͯ͠ΈΔ
