ES6导入/导出不使用变量？流星

Question

为什么这样做

export var Tasks = new Mongo.Collection('tasks');

但这不是吗？

var Tasks = new Mongo.Collection('tasks');
export Tasks

Answer 1

因为这不是导出变量的标准方法。查看documentation：

export { name1, name2, …, nameN };
export { variable1 as name1, variable2 as name2, …, nameN };
export let name1, name2, …, nameN; // also var
export let name1 = …, name2 = …, …, nameN; // also var, const

export default expression;
export default function (…) { … } // also class, function*
export default function name1(…) { … } // also class, function*
export { name1 as default, … };

export * from …;
export { name1, name2, …, nameN } from …;
export { import1 as name1, import2 as name2, …, nameN } from …;

所以你可以做的是

export { Tasks };

Answer 2

请尝试以下语法：

var Tasks = new Mongo.Collection('tasks');
export { Tasks }

我还建议使用camelCase作为变量名。

Answer 3

使用的最佳做法export const Tasks = new Meteor.Collection('tasks');