[js] 写一个方法，将字符串中的单词倒转后输出，如：`my love` -> `ym evol`

let b = "my love"
function fn(b){
	return b.split(" ").map(val => val.split("").reverse().join("")).join(" ")
}
console.log(fn(b)) //ym evol

let wordReversal = str => 
    str
        .split(' ')
        .map(e => e.split('').reverse().join(''))
        .join(' ')

const reverseStr = (str) =>
  str
    ? str
        .split("")
        .reverse()
        .join("")
    : str;


console.log(reverseStr('my love'));
console.log(reverseStr('abc cba abc'));

const reverseStr = str => {
  if (typeof str !== "string") throw new Error("The argument must be a string");
  return str
    .split(" ")
    .map(v =>
      v
        .split("")
        .reverse()
        .join("")
    )
    .join(" ");
};

console.log(reverseStr("my love"));
console.log(reverseStr("js upupup"));
console.log(reverseStr(123));

function reverseStr (str) {
  return str.split('').reverse().join('')
}