JS_剑指 Offer 05. 替换空格
输入:s = "We are happy."
输出:"We%20are%20happy."
思路:遍历一遍即可
/**
* @param {string} s
* @return {string}
*/
var replaceSpace = function(s) {
let res = '';
for(let i = 0; i < s.length; i ++){
if(s[i] == ' '){
res+='%20';
}else{
res+=s[i];
}
}
return res;
};