What is the difference between the Var a=new Object () and the Var a={} in JS?

There should be no difference, both of which are generating a default object object.
JS and other languages, all objects are the base class is object, so the new object () and simple {} is the same empty object, is the default object.
Originally I thought {} should be an object without any properties and methods, but it turns out that the method of the object object, such as var a = {},a.tostring (), has a.
This can also be judged, in fact a = {} is a = new Objcet () simple implementation.
Just like in the Java language, string str = "" and string str = new string () are all objects that create a string.



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What is the difference between the Var a=new Object () and the Var a={} in JS?