Ecma262-3 execution environment exercise

1. Lexical Scope

 Function  C1 (){  Return  D1  ++  }
  Function  A1 (){  VaR  D1  =  0  ;  Return  C1 ();}
Console.info (A1 ())
  // D1 undefined C1 is defined externally in A1  
  
  //  1 error. CC not found in variable object  
  Alert (cc)

  //  2 undefined. The parameter CC is found in the variable object, but no value is assigned.  
  VaR  Xx  =  Function  (Cc ){
Alert (cc)
}()

  // 3 error. The variable object sets the parameter o = undefined.  
  VaR  Xx  =  Function  (O ){
Alert (O.)
}()

  //  4 error. Variable object declares o = undefined  
  Alert (O.)
  VaR  O  =  {}

  // 6 undefined. After the execution, O is the object.  
  Alert (O.)

  //  7 error. Variable object declares o = undefined  
  VaR  O;
Alert (O.) 

2. Scope chain parameter> function declaration> variable Declaration

 //  If the parameter has been declared but has no value, it is undefined.  
//  However, if the parameter is not declared, it will be searched up.  
  
 //  1 undefined. In a function, the variable object parameter A = undefined, Which is preferentially used.  
  VaR  A22  =  0  ;
  VaR  Xx  =  Function  (A22) {alert (A22 )}()

  //  2 parameter a2 = undefined. B2 cannot be found, and then it finds = 4.  
 VaR  D2  =  Function  (A2 ){
  VaR  A2  =  3  , B2  =  4  ;
  VaR  C2  =  Function (A2 ){
Alert (A2)
Alert (B2)
}()
}() 

3. Sequence 

 Console.info (  Typeof  Ss3)  //  Function  
  VaR  Ss3  =  2  
  Function  Ss3 () {alert (  " OK  "  )}
Console.info (  Typeof  Ss3)  //  Number  
  
  //  The first output is function because the followingCodeNot executed. In the variable object, the function SS declares that the type is function, and the declaration of the variable SS cannot overwrite the function ss.  
//  The second output is the number, because the following code has been executed and the SS is assigned a value of 2,  
// See http://www.javaeye.com/topic/812668 if you do not understand 

Four block-level declarations 

 //  FF = 1 Ie = 2. FF can be declared in block level?  
  
  Function  F () {alert (  1  )};
F ();
  If  (  1  ){  Function  F () {alert ( 2  )}}
  ---------------------------------------  
  For  (  VaR  I4  =  0  ; I4  <  5  ; I4  ++  ){  If (I4  =  3  )  Break  }
Alert (I4)
  //  I4 is a global scope 

5. Anonymous and naming Functions

 //  Solution to the function declaration in block-level elements, so that both ff and IE are first  
  ---  
  VaR  Foo;
  If (  True  ){
Foo  =  Function  (){
  Return     '  First  '  ;
}
}
  Else  {
Foo  =  Function  (){
 Return     '  Second  '  ;
}
}
Alert (FOO ())