Data type judgment mode

A, typeof data type is determined

　　

　　From the above chart, an array of type Array, object type Object, null types are returned Object, so it should be broken down.

Two, instanceof determines whether a reference to a particular example

　　

Three, constructor data type is determined

　　

　　constructo based on a plurality of types, determining an array of objects when using typeof, regular, time for the object, but when using the constructor can determine the correct type, the above drawback is only available in IE8

四、obj.prototype.toString()

　　

　　Based on various types of objects, or the call you will need apply.

 

The film Reference: https://www.cnblogs.com/crackedlove/p/10331317.html