你可以利用 function.bind 來改變呼叫函式的對象(this): JS Bin

try starck.callBySelf(); or starck.callByWindow(); in console.

function.bind

For a given function, creates a bound function that has the same body as the original function. In the bound function, the this object resolves to the passed in object. The bound function has the specified initial parameters.

function.bind(thisArg[,arg1[,arg2[,argN]]])

Reference

Callback 的應用: JS Bin try starck.say('hi')