<form>        <input type="text" class="txt">        <input type="button" class="btn" value="确认">    </form>    <span class="input-data"></span>

    var FormView=Backbone.View.extend({        el:‘form‘,        events:{            "blur .txt":"showdata",            "click .btn":"click"        },        showdata:function(){            console.log(this.$el);        },        click:function(){            console.log("confirm");        }    });    var form=new FormView();