The conversion rule of "= =" in JS

Number type is compared to string type, string is converted to number type

        // false        0 = = "'//true;        0 = = ' 0 '//true        ' \t\r\n ' ==0//true

null and undefined type comparisons are always equal

NULL // true

A Boolean type is compared to any other type, and the Boolean type is converted to the number type

        false = = ' false '//false         = = ' 0 '//false         Falsenull//false        null//true

Number or string type is compared to type object, number or string type is converted to type Object

        var a = 0, B = {};          = = B//false

Please always use = = = and!===

The conversion rule of "= =" in JS