8. = = and = = =?

===
1、 If the type is different , Just [ It's not equal ] 
2、 If both are numerical , And it's the same value , that [ equal ].
3、 If both are strings , The characters in each position are the same , that [ equal ]; otherwise [ It's not equal ] 
4、 If both values are true, Or both false, that [ equal ].
5、 If both values refer to the same object or function , that [ equal ]; otherwise [ It's not equal ].
6、 If both values are null, Or both undefined, that [ equal ].

==
1、 If the two value types are the same , Conduct ===  Compare .
2、 If the two value types are different , They may be equal . Carry out type conversion according to the following rules and then compare 
 a、 If one is null、 One is undefined, that [ equal ]. 
 b、 If one is a string , One is numerical value , Convert a string into a numeric value and compare it .
 c、 If any value is true, Turn it into 1  Compare again ; If any value is false, Turn it into 0  Compare again .
 d、 Any other combination , all [ It's not equal ].