2018-10-10 22:03:03 +00:00
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---
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id: 5a94fe3669fb03452672e45f
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2020-12-16 07:37:30 +00:00
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title: 使用 repeat 函数减少重复
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2020-02-11 13:39:15 +00:00
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videoUrl: 'https://scrimba.com/p/pByETK/cQvqyHR'
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forumTopicId: 301133
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2021-01-13 02:31:00 +00:00
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dashedName: reduce-repetition-using-the-repeat-function
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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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2021-01-08 19:20:48 +00:00
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使用 `grid-template-columns` 或 `grid-template-rows` 定义网格结构时,你需要为添加的每一行或每一列都输入一个值。
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2020-12-16 07:37:30 +00:00
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2021-02-06 04:42:36 +00:00
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如果一个网格共有 100 行且每行高度相同, 那我们就需要输入 100 个值,这显然不太实际。 为此,更好的方式是使用 `repeat` 方法指定行或列的重复次数,后面加上逗号以及需要重复的值。
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2020-12-16 07:37:30 +00:00
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2021-01-08 19:20:48 +00:00
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以下为添加 100 行网格的例子,每行高度均为 50px:
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2020-02-11 13:39:15 +00:00
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```css
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grid-template-rows: repeat(100, 50px);
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```
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2021-02-06 04:42:36 +00:00
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你还可以用 repeat 方法重复多个值,并在定义网格结构时与其他值一起使用。 比如:
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2020-02-11 13:39:15 +00:00
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```css
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grid-template-columns: repeat(2, 1fr 50px) 20px;
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```
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效果相当于:
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```css
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grid-template-columns: 1fr 50px 1fr 50px 20px;
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```
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2021-01-08 19:20:48 +00:00
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**注意:**`1fr 50px` 重复了两次,后面跟着 20px。
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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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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-01-08 19:20:48 +00:00
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请用 `repeat` 代替 `grid-template-columns` 属性值中的重复代码。
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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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2021-01-08 19:20:48 +00:00
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class 为 `container` 的元素应具有 `grid-template-columns` 属性,其属性值应设置为重复 3 列,且每列宽度为 `1fr`。
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2020-02-11 13:39:15 +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(
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code.match(
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/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?3\s*?,\s*?1fr\s*?\)\s*?;[\s\S]*}/gi
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)
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-02-11 13:39:15 +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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```html
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<style>
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.item1{background:LightSkyBlue;}
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.item2{background:LightSalmon;}
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.item3{background:PaleTurquoise;}
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.item4{background:LightPink;}
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.item5{background:PaleGreen;}
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.container {
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font-size: 40px;
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min-height: 300px;
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width: 100%;
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background: LightGray;
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display: grid;
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/* Only change code below this line */
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grid-template-columns: 1fr 1fr 1fr;
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/* Only change code above this line */
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grid-template-rows: 1fr 1fr 1fr;
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grid-gap: 10px;
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}
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</style>
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<div class="container">
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<div class="item1">1</div>
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<div class="item2">2</div>
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<div class="item3">3</div>
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<div class="item4">4</div>
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<div class="item5">5</div>
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</div>
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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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```html
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<style>.container {grid-template-columns: repeat(3, 1fr);}</style>
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```
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