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简单题
请实现一个函数,把字符串 s 中的每个空格替换成"%20"。
输入:s = "We are happy."
输出:"We%20are%20happy
var replaceSpace = function(s) {
s = s.split("");
let oldLen = s.length;
let spaceCount = 0;
for (let i = 0; i < oldLen; i++) {
if (s[i] === ' ') spaceCount++;
}
s.length += spaceCount * 2;
for (let i = oldLen - 1, j = s.length - 1; i >= 0; i--, j--) {
if (s[i] !== ' ') s[j] = s[i];
else {
s[j - 2] = '%';
s[j - 1] = '2';
s[j] = '0';
j -= 2;
}
}
return s.join('');
};