用JavaScript替换字符串
我们需要编写一个JavaScript函数，该函数接受一个字符串并构造一个新字符串，该字符串将原始字符串中的所有大写字符转换为小写，并将所有原始字符的小写字符转换为小写。
例如：如果字符串是-
const str = 'The Case OF tHis StrinG Will Be FLiPped';
输出结果
那么输出应该是-
const output = 'tHE cASE of ThIS sTRINg wILL bE flIpPED';
示例
为此的代码将是-
const str = 'The Case OF tHis StrinG Will Be FLiPped';
const isUpperCase = char => char.charCodeAt(0) >= 65 && char.charCodeAt(0)<= 90;
const isLowerCase = char => char.charCodeAt(0) >= 97 && char.charCodeAt(0) <= 122;
const flipCase = str => {
let newStr = '';
const margin = 32;
for(let i = 0; i < str.length; i++){
const curr = str[i];
if(isLowerCase(curr)){
newStr += String.fromCharCode(curr.charCodeAt(0) - margin);
}else if(isUpperCase(curr)){
newStr += String.fromCharCode(curr.charCodeAt(0) + margin);
}else{
newStr += curr;
};
};
return newStr;
};
console.log(flipCase(str));输出结果
控制台中的输出-
tHE cASE of ThIS sTRINg wILL bE flipped