Object value taking method in JS And []

JS There are two ways to get values for objects in —— Namely Use . And use []

Generally speaking , Object values are obtained by using .
How to write it ：

let obj={
    
	name:" nickname ",
	value:" value ",
}
console.log(obj.name);// Output nickname 
console.log(obj.value);// Output value 

Use . It is common to take values in the form of , But you can't use string variables or numbers for attribute names
Like this ：

// Wrong writing 
obj.'name';
obj.10;
// This way of writing is wrong 
// The best way to meet this requirement is to use [] To get the object value 

Use [] Writing ：

let obj={
    
	name:"namename",
	value:"content",
	10:"ten",
}
console.log(obj[10]);// Output ten
console.log(obj['name']);// Output namename

It is [] The writing characteristics of , We can use for Loop to get a single object value

let arr=['name','value'];
let obj={
    
	name:"111",
	value:"222"
}
for(let i=0;i<=arr.length-1;i++){
    
	console.log(obj[arr[i]]);
}
// Output 111
// 222