var obj = {};
1,toString( recommend ) === '[object Object]'
obj.constructor === Object
3,instanceof Note that arrays are also objects , So use arr instanceof Object Also for true.
obj instanceof Object
typeof obj === Object // according to typeof The judgment object is not very accurate expression Return value typeof undefined 'undefined'
typeof null 'object' typeof true 'boolean' typeof 123 'number' typeof "abc"
'string' typeof function() {} 'function' typeof {} 'object' typeof [] 'object'
Determine whether the specified parameter is a pure object ( so-called " Pure object ", Is that the object is passed "{}" or "new Object" Created .)

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