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properties in JavaScript

 
Greenhorn
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Properties belong to Object . we can add or delete them. var that we define become properties of window dom object . but we can not delete var , I am confused if we can delete properties of object why we can not delete var(they are properties of window)
 
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Only top-level vars become properties of the window object, not block-level vars, and that is an implementation detail of the browser. There is no window object in other JavaScript environments. So don't think of vars as properties of some global object in general.

P.S. In modern JavaScript (not "java script") var should not be used; use let and const which have clearer semantics. And, write modular code, avoiding global-level declarations.
 
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