我需要在以下函数中添加方法getInitials,以便在将john和doe输入为参数时返回JD。
我已经写了一些代码。仍然出现错误。
function Person(firstName, lastName) {
var firstName, LastName;
this.getInitials = function(){
firstNameString = firstName.toString();
lastNameString = lastName.toString();
firstLetterOutput = firstNameString.charAt(0).toUpperCase();
lastLetterOutput = lastNameString.charAt(0).toUpperCase();
return firstLetterOutput + lastLetterOutput ;
}
}
/* Do not modify code below this line */
const johnDoe = new Person('john', 'doe');
console.log(johnDoe.getInitials(), '<-- should be "JD"');
应返回“ JD”