"Hungry big front node. JS Advanced Tutorial"-javascript basic problem-Reference delivery

"Hungry big front node. JS Advanced Tutorial" Address: Https://github.com/ElemeFE/node-interview

1. How to write a copy function of a JSON object

function Clone (obj) {

var result;

if (Array.isarray (obj)) {

result = [];

Obj.foreach (item) = {

Result.push (Clone (item));

});

} else if (typeof obj = = = ' object ') {

result = {};

for (key in obj) {

Result[key] = Clone (Obj[key]);

}

} else {

result = obj;

}

return result;

}

If it's a date or a regexp type, it has to be judged.

The difference between 2.== and = = =

= = is equal on both sides, = = = is equal to not only the value equal type

3. [1] == [1] Yes true or nofalse

Do not think, it must be false, because it is a reference type, the comparison is the address;

"Hungry big front node. JS Advanced Tutorial"-javascript basic problem-Reference delivery