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]; 
} 

请参阅链接。我无法弄清楚如何在名字和姓氏之间加上一个简单的空格。我一直在这个几个小时请帮忙！

Answer 1

使用字符串连接

return lastName +', '+ firstName; 

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

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

，如果你的任务是真正处理给定数组不是使用Array.prototype.join() method与所需分离参数', '

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

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

Answer 2

您应该返回串接的姓和名的字符串。试试这个：

return lastName +", "+ firstName; 

Answer 3

尝试join(', ')

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