About-javascript-closure Scope records

JS want to write some concepts always understand clearly the recent summary of some closures and scope of the case as follows

Example 1.

1 varName = "the window";2     varObject = {3Name: "My Object",4Getnamefunc:function()5         {6             return function()7             {8                 return  This. Name;9             };Ten         } One     }; A  -Alert (Object.getnamefunc () ());//=>the Window

This is an example of a search on the internet.

Make a try First

var name = "the window";     var object = {        "My object",        function()        {              Returnfunction()            {                returnthis. name;            };        }    };    Alert (Object.getnamefunc ()); // Watch this .

Returned is the

function ()            {                returnthis. name;            };

Then this example is well understood to actually return to

var Object=this. Name//=>this is window

Example 2.

Made a few changes as follows

1 varName = "the window";2     varObject ={3Name: "My Object",4Getnamefunc:function()5         {6             return(function()7             {8                 return  This. Name;9             })();Ten         } One     }; A     -Alert (Object.getnamefunc ());//=>the Window

1  varName = "the window";2     varObject ={3Name: "My Object",4Getnamefunc:function()5         {6             return(function(_this)7             {8                 return_this.name;9})( This);Ten         } One     }; A      -Alert (Object.getnamefunc ())//My Object

The method of anonymous function The second kind should be more common use of the scope of the characteristics of the parameter

Example 3.
Try it yourself.

1 varOa=0;2 3Alert (A () ());//=>24 5     functionA ()6     {7         varOA = 1;8++OA;9         returnB (OA);Ten     } One  A     functionB (OA) -     { -         return function() the         { -             returnOA; -         }; -}

1 varOa=0;2 3Alert (A () ());//24 5     functionA ()6     {7         varOA = 1;8++OA;9         return(function()Ten         { One             return function() A             { -                 returnOA; -             }; the         })(); -}

The example itself is not very clear and a little confused

About-javascript-closure Scope records