2018-10-10 18:03:03 -04:00
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---
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id: 587d78a3367417b2b2512ace
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2020-12-16 00:37:30 -07:00
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title: 使用 float 属性将元素左浮动或右浮动
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2018-10-10 18:03:03 -04:00
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challengeType: 0
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2020-02-11 15:46:34 +08:00
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videoUrl: 'https://scrimba.com/c/c2MDqu2'
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forumTopicId: 301066
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2021-01-13 03:31:00 +01:00
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dashedName: push-elements-left-or-right-with-the-float-property
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2018-10-10 18:03:03 -04:00
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---
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2020-12-16 00:37:30 -07:00
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# --description--
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2018-10-10 18:03:03 -04:00
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2021-02-06 04:42:36 +00:00
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接下来要介绍的定位机制并不是 `position` 属性的选项，而是通过元素的 `float` 属性来设置。 浮动元素不在文档流中，它向 `left` 或 `right` 浮动，直到它的外边缘碰到包含框或另一个浮动框的边框为止。 通常需要用 `width` 属性来指定浮动元素占据的水平空间。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --instructions--
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2018-10-10 18:03:03 -04:00
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2021-02-06 04:42:36 +00:00
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使这两个元素按两列布局，`section` 和 `aside` 左右排列。 设置 `#left` 元素的 `float` 属性值为 `left`，设置 `#right` 元素的 `float` 属性值为 `right`。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --hints--
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2018-10-10 18:03:03 -04:00
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2021-01-08 11:20:48 -08:00
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id 为 `left` 的元素的 `float` 属性值应为 `left`。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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assert($('#left').css('float') == 'left');
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2018-10-10 18:03:03 -04:00
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```
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2021-01-08 11:20:48 -08:00
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id 为 `right` 的元素的 `float` 属性值应为 `right`。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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assert($('#right').css('float') == 'right');
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2018-10-10 18:03:03 -04:00
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```
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2020-02-11 15:46:34 +08:00
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2021-01-13 03:31:00 +01:00
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# --seed--
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## --seed-contents--
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```html
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<head>
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<style>
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#left {
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width: 50%;
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}
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#right {
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width: 40%;
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}
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aside, section {
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padding: 2px;
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background-color: #ccc;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>Welcome!</h1>
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</header>
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<section id="left">
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<h2>Content</h2>
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<p>Good stuff</p>
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</section>
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<aside id="right">
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<h2>Sidebar</h2>
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<p>Links</p>
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</aside>
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</body>
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```
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2020-12-16 00:37:30 -07:00
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# --solutions--
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2021-01-13 03:31:00 +01:00
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```html
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<head>
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<style>
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#left {
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float: left;
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width: 50%;
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}
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#right {
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float: right;
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width: 40%;
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}
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aside, section {
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padding: 2px;
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background-color: #ccc;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>Welcome!</h1>
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</header>
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<section id="left">
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<h2>Content</h2>
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<p>Good stuff</p>
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</section>
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<aside id="right">
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<h2>Sidebar</h2>
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<p>Links</p>
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</aside>
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</body>
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```
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