JS-是否可以检查变量是否为对象？

Question

I'm trying to check if a variable is an object like so:

if(obj && typeof obj === Object) {
    console.log('obj is an object and does not return null value');
}

what am i missing?

Answer 1

typeof returns a string representation of the type, but if you want to check for null then

if(typeof obj === 'object' && obj !== null) {
    console.log('obj is an object and does not return null value');
}

Answer 2

您的代码很好，只需将Object替换为“ object”字符串即可：)

Answer 3

It should be;

typeof obj === 'object'

The typeof operator uses strings as identifiers. You can read more about it on MDN .

Answer 4

'[object Object]' == Object.prototype.toString.call(obj)

Answer 5

the best way to do it is using instanceOf , best practice

if(obj instanceof Object) {
    console.log('obj is an object and does not return null value');
}