/* 
颠倒字符串
 思路：利用reverse()
 */

const str = "I am a student";
var reverseEntireSentence1 = reverseString(str,""); //以引号作为分隔符
var reverseEntireSentence2 = reverseString(str," "); //以空格作为分隔符
var reverseEachWord = reverseString(reverseEntireSentence1," ");
function reverseString(str,separator) {
    
    
	return str.split(separator).reverse().join(separator);
}

console.log(reverseEntireSentence1); //tneduts a ma I
console.log(reverseEntireSentence2); //student a am I
console.log(reverseEachWord); //I ma a tneduts