javascript - Access instance of anonimous function inside of itself -

how instance of anonymous function inside of itself?

function () {     //how access this?  } 

it must anonymous, callback, , in function passed attaching property callback , invoke it. should return own property.

function parent (val) {     val.someprop = "abc"     val() } parent(function(){     return this.someprop; // how access someprop because window? }) 

also can't pass props it.

i'm not sure programming practise send argument itself:

function parent(val) {     val.someprop = "abc";     val(val); }  parent(function(val){     console.log(val.someprop); });