code: function Image(editor) {
      this.editor = editor
      const imgMenuId = getRandom('w-e-img')
      this.$elem = $('<div class="w-e-menu" id="' + imgMenuId + '"><i class="w-e-icon-image"></i></div>')
      editor.imgMenuId = imgMenuId
      this.type = 'panel'
  
      // 当前是否 active 状态
      this._active = false
  }
docs: 构造函数