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?
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');
}
您的代码很好,只需将Object替换为“ object”字符串即可:)
It should be;
typeof obj === 'object'
The typeof
operator uses strings as identifiers. You can read more about it on MDN .
'[object Object]' == Object.prototype.toString.call(obj)
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');
}
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