leetCode520.js

var detectCapitalUse = function(word) {
    if(word === word.toLowerCase() || word === word.toUpperCase()){
       return true;
     }else if(word[0] === word[0].toUpperCase() && word.substring(1) === word.substring(1).toLowerCase()){
         return true;
     }else{
         return false;
     }
};