var obj1 = { 

    num : 1,

    str : 'foo',

    obj : { less: 'more' }

};

var obj2 = Object.create( obj1 );

​

console.log( '[1] obj1:', obj1 );

console.log( '[1] obj2:', obj2 );

​

obj1.num = 3;

obj1.str = 'bar';

obj1.obj.less = 'less';

​

console.log( '[2] obj1:', obj1 );

console.log( '[2] obj2:', obj2 );

​

console.log( obj1.hasOwnProperty( 'prototype' ) );

console.log( obj2.hasOwnProperty( 'prototype' ) );

for( var prop in obj1 ) console.log( '[3] obj1.hasOwnProperty( ' + prop + ' ): ' + obj1.hasOwnProperty( prop ) );

for( var prop in obj2 ) console.log( '[3] obj2.hasOwnProperty( ' + prop + ' ): ' + obj2.hasOwnProperty( prop ) );

​

obj2.num = 1;

obj2.str = 'baz';

obj2.obj.less = 'more';

​

console.log( '[4] obj1:', obj1 );

console.log( '[4] obj2:', obj2 );

for( var prop in obj1 ) console.log( '[4] obj1.hasOwnProperty( ' + prop + ' ): ' + obj1.hasOwnProperty( prop ) );

for( var prop in obj2 ) console.log( '[4] obj2.hasOwnProperty( ' + prop + ' ): ' + obj2.hasOwnProperty( prop ) );

​

obj2.obj = Object.create( obj1.obj );

​

console.log( '[5] obj1:', obj1 );

console.log( '[5] obj2:', obj2 );

for( var prop in obj1 ) console.log( '[5] obj1.hasOwnProperty( ' + prop + ' ): ' + obj1.hasOwnProperty( prop ) );

for( var prop in obj2 ) console.log( '[5] obj2.hasOwnProperty( ' + prop + ' ): ' + obj2.hasOwnProperty( prop ) );

​

obj2.obj.less = 'less';

​

console.log( '[6] obj1:', obj1 );

console.log( '[6] obj2:', obj2 );