Way 12-1- defined functions

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    // function can be bracketed since the implementation of 


    // the let A = function () { 
    //      Alert (. 1); 
    // }; 
    // A (); 

    // only functions to perform parentheses 
    // the let-10 A = VUE-Router; 
    // A ();// error 

    //This is possible, the browser will first parse 
    // A (); 
    // function A () { 
    //      Alert (. 1); 
    // } 

    // This is not a 
    // A (); 
    // the let A function = () { 
    //      Alert (. 1); 
    // } 

    the let a =  function B () { 
        Alert ( . 1 ); 
    }; 
    // a call is outside 
    // not be used outside B 
    // B may be used within a function 
    // inside a and b are the same as 
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