Example of what Bind() does in Javascript

codesample-bind.js

var unbound = function() {
  console.log(this.seven);
}

unbound(); //Nothing: seven isn't defined.

var ThisIsSeven = {
  "seven": 7
};

var bound = unbound.bind(ThisIsSeven);

bound(); //7 is printed to the console; the "this" keyword referrs to `ThisIsSeven`

window.setTimeout((function() {
  console.log("This works for anonymous functions, too,");
  console.log("when you have bound them like this.");
  console.log("How many are we", this.seven);
}).bind(ThisIsSeven), 1000);