angular.extend

function f1() {}
var f2 = angular.extend(f1, {
    active: false,
    toggle: function() {
        this.active = !this.active
    }
})
console.log(f1, f1.active)
console.log(f2, f2.active)
f1.toggle()
console.log(f1, f1.active)
console.log(f2, f2.active)
var o1 = {
    a: ‘a‘
}
var o2 = angular.extend(o1, {
    b: ‘b‘
})
console.log(o1, o2)