2018-10-10 22:03:03 +00:00
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---
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id: 587d7db2367417b2b2512b8c
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2021-03-15 03:20:39 +00:00
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title: 使用 IIFE 创建一个模块
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2018-10-10 22:03:03 +00:00
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challengeType: 1
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2020-08-04 07:15:28 +00:00
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forumTopicId: 301332
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2021-01-13 02:31:00 +00:00
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dashedName: use-an-iife-to-create-a-module
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-03-15 03:20:39 +00:00
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一个立即调用函数表达式(IIFE)通常用于将相关功能分组到单个对象或者是 <dfn>module</dfn> 中。 例如,先前的挑战中定义了两个 mixins:
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2020-08-04 07:15:28 +00:00
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```js
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function glideMixin(obj) {
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obj.glide = function() {
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console.log("Gliding on the water");
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};
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}
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function flyMixin(obj) {
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obj.fly = function() {
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console.log("Flying, wooosh!");
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};
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}
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```
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2021-03-15 03:20:39 +00:00
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我们可以将这些 mixins 分成以下模块:
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2020-08-04 07:15:28 +00:00
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```js
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let motionModule = (function () {
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return {
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glideMixin: function(obj) {
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obj.glide = function() {
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console.log("Gliding on the water");
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};
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},
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flyMixin: function(obj) {
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obj.fly = function() {
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console.log("Flying, wooosh!");
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};
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}
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}
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2021-03-15 03:20:39 +00:00
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})();
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2020-08-04 07:15:28 +00:00
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```
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2021-03-15 03:20:39 +00:00
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注意:一个立即调用函数表达式(IIFE)返回了一个 `motionModule` 对象。 返回的这个对象包含了作为对象属性的所有 mixin 行为。 module 模式的优点是,所有的运动相关的行为都可以打包成一个对象,然后由代码的其他部分使用。 下面是一个使用它的例子:
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2020-08-04 07:15:28 +00:00
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```js
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motionModule.glideMixin(duck);
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duck.glide();
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```
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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创建一个名为 `funModule` 的模块,将这两个 mixins:`isCuteMixin` 和 `singMixin` 包装起来。 `funModule` 应该返回一个对象。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`funModule` 应该被定义并返回一个对象。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(typeof funModule === 'object');
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2018-10-10 22:03:03 +00:00
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```
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2021-03-15 03:20:39 +00:00
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`funModule.isCuteMixin` 应该访问一个函数。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert(typeof funModule.isCuteMixin === 'function');
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2018-10-10 22:03:03 +00:00
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```
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2021-03-15 03:20:39 +00:00
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`funModule.singMixin` 应该访问一个函数。
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2020-08-04 07:15:28 +00:00
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert(typeof funModule.singMixin === 'function');
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2018-10-10 22:03:03 +00:00
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```
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2020-08-04 07:15:28 +00:00
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --seed-contents--
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```js
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let isCuteMixin = function(obj) {
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obj.isCute = function() {
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return true;
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};
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};
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let singMixin = function(obj) {
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obj.sing = function() {
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console.log("Singing to an awesome tune");
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};
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};
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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```js
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const funModule = (function () {
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return {
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isCuteMixin: obj => {
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obj.isCute = () => true;
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},
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singMixin: obj => {
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obj.sing = () => console.log("Singing to an awesome tune");
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}
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};
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})();
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```
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