在javascript中添加空格？

Question

// If given "George", "Washington" as arguments, it should return "Washington, George" 
function formatName(firstName, lastName) { 
    return [lastName, firstName]; 
} 

請參閱鏈接。我無法弄清楚如何在名字和姓氏之間加上一個簡單的空格。我一直在這個幾個小時請幫忙！

Answer 1

使用字符串連接

return lastName +', '+ firstName; 

function formatName(firstName, lastName) { 
 
    return lastName +', '+ firstName; 
 
} 
 

 
console.log(formatName("George","Washington"))

，如果你的任務是真正處理給定數組不是使用Array.prototype.join() method與所需分離參數', '

function formatName(firstName, lastName) { 
 
    return [lastName, firstName].join(', '); 
 
} 
 

 
console.log(formatName("George","Washington"))

Answer 2

您應該返回串接的姓和名的字符串。試試這個：

return lastName +", "+ firstName; 

Answer 3

嘗試join(', ')

function formatName(firstName, lastName) { 
    return [lastName, firstName].join(', '); 
}