如何从javascript中的数组获取名称？

Question

I am fairly new to JavaScript and I am trying to extract the name Sam from the array. The output that I'm getting is name. How do I get Sam? Thank you in advance. I apologize but I know this is a fairly novice question.

I am trying to loop by using forEach.

let Person = {
  name: ['Sam']
}

let handler = Object.keys(Person)

handler.forEach(function(element){
  console.log(element)
})

Answer 1

• Object.keys() only gives you keys
• Use Object.entries() if you want key and value
• Use Object.values() if you only want values

 let Person = { name: ['Sam'] } for (const fn of ["values", "keys", "entries"]) { console.log(`Using: Object.${fn}()`); for (const v of Object[fn](Person)) { console.log(v); } } 

Answer 2

代替Object.keys使用Object.values

Answer 3

If you know in advance that your name array is located under the key name , then access it directly

 const person = { name: ['Sam'] }; console.log(person.name); console.log(person.name[0]); 

Otherwise, use Object.values() to enumerate the values in the object, but you might get more values than simply the names array and you will have to find out which value contains the names you are looking for:

 const person = { name: ['Sam'], anotherProp: 'hello' }; console.log(Object.values(person)); 

Using Object.entries() is not helpful in this situation as if you use it, it means that you know under which property is located your name array, and if this is the case, simply access the array directly.

Answer 4

If you use Object.keys() you can get the value by using object[key] bracket notation or object.key dot notation.

Object.keys(obj).forEach(key => obj[key]);

 let Person = { name: ['Sam'] } Object.keys(Person).forEach(name => console.log(`${name} = ${Person[name]}`)); 

Answer 5

 let Person = { name: ['Sam',"Bob","Alice"] } let count = Person.name.length; for(let i = 0; i<count; i++){ console.log( Person.name[i]) }