javascript - Shouldn't this variable default to "top-level"? -

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Currently the result is undefined and I do not understand why this is. 

  var variable = "top-level"; Function parent function () {function childFunction () {warning (variable); } Childfunction (); Var variable = "local"; } Parent function ();   
 I thought that because I declared a variable  
  var vari = "local"; After I called the child function, it will look at the scope chain and instead will get top level variables, but it seems that this is not the case.  
  
 
 
 This is due to the hosting, which is at the top of the  var  The statement is inserting, but still executes the assignment statement on that line. If you have a look below, then the second  var variable  will shade the global variable because it announces a local variable with the same name.  
 Actually, what your code does:  
  var variable = "top-level"; Function parent function () {var variables; Function child function () {warning (variable); } Childfunction (); Variable = 'local'; } Parent function ();

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