backbone extend problem

gistfile1.js

var superView = Backbone.View.extend({
    initialize: function(){
       if(this.val2) this.op.c = this.val2;
        console.log(this.op);
    },
    op: {a:"B"},
    m1: function(){},
    m2: function(){},
    events1: {
      "click div":"m1"
    }
});

var childView = superView.extend({
    val2: "YA",
    extendEvents: {
       "click span":"m2"
    }
});
new superView();
new childView();
new superView();