js obj应该通过引用传递，但似乎已克隆

Question

I have learned that objects in javascript is passed by reference, so if I delete one, they will both be inaccessible.

Now,

var self = self.parent.modules[moduleId].slideshow;

delete self.parent.modules[moduleId].slideshow; //remove the module object from the JSON

console.error('deleted self. it is now:');                
console.error(self.parent.modules[moduleId].slideshow);

that console prints undefined, as expected. However, if I do this:

console.error('deleted self. it is now:');                
console.error(self);

It still has the object to present me with, as if it was actually cloned?

Answer 1

You deleted the property not the value that property referenced.

Other references that value are unaffected.