Backbone js:如何删除视图中的额外标签？

var MyView = Backbone.View.extend({
  tagName: 'div',
  render: function() {
    this.$el.html('<p>Hello, world!</p>');
    return this;
  }
});

var MyView = Backbone.View.extend({
  className: 'my-view',
  render: function() {
    this.$el.html('<p>Hello, world!</p>');
    return this;
  }
});

var MyView = Backbone.View.extend({
  el: '#my-element',
  render: function() {
    this.$el.html('<p>Hello, world!</p>');
    return this;
  }
});

var MyView = Backbone.View.extend({
  events: {
    'click .my-button': 'onButtonClick'
  },
  render: function() {
    this.$el.html('<button class="my-button">Click me!</button>');
    return this;
  },
  onButtonClick: function() {
    console.log('Button clicked!');
  }
});