我正在尝试分析 TodoMVC 的 Ember 示例。#each 助手的第二个参数是什么意思?
<ul id="todo-list">
{{#each filteredTodos itemController="todo"}}
<li {{bindAttr class="isCompleted:completed isEditing:editing"}}>
{{#if isEditing}}
{{view Todos.EditTodoView todoBinding="this"}}
{{else}}
{{view Ember.Checkbox checkedBinding="isCompleted" class="toggle"}}
<label {{action "editTodo" on="doubleClick"}}>{{title}}</label>
<button {{action "removeTodo"}} class="destroy"></button>
{{/if}}
</li>
{{/each}}
</ul>
它应该是一个选项哈希,但我不确定。