[英]How to change state of button on click and revert back to the original state when clicked again in React?
[英]why does this code change the string but again revert back to original state
function capital(b){
let letter = b[0].toUpperCase();
return letter + b.slice(1);
}
function correction(a){
let place = a.indexOf('_');
let part1 = a.slice(0, place);
let part2 = a.slice(place+1);
a = part1 + capital(part2);
if (a.includes('_'))
correction(a);
return a;
}
當我調用correction("Hey_there_How_are_you")
,我在調試時看到它變成了 "HeyThereHowAreYou" 但又變成了原始字符串本身。 可能是什么問題呢?
您需要在條件中返回調用結果,以便再次使用。
function capital(b) { let letter = b[0].toUpperCase(); return letter + b.slice(1); } function correction(a) { let place = a.indexOf('_'); let part1 = a.slice(0, place); let part2 = a.slice(place + 1); a = part1 + capital(part2); if (a.includes('_')) { return correction(a); } return a; } let x = correction("Hey_there_How_are_you"); console.log(x);
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