", "", "disabled", ""], [3, "value", 4, "ngFor", "ngForOf"], ["type", "text", "name", "firstname", "formControlName...", "lastName", 1, "form-control", 3, "placeholder"], ["type", "email", "name", "email", "formControlName...", "email", 1, "form-control", 3, "placeholder"], ["type", "password", "name", "password", "formControlName..."password", 1, "form-control", 3, "placeholder"], ["type", "password", "name", "confirmpassword", "formControlName...组件定义中元数据属性的示例包括有关视图封装模式的元数据、组件是否使用 OnPush 更改检测策略、组件视图可用的指令定义、组件选择器和生命周期挂钩。