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# tween.js

tween.js是用于简单动画的JavaScript补间引擎，结合了优化的 Robert Penner 方程。

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Travis tests][travis-image]][travis-url]
[![Flattr this][flattr-image]][flattr-url]
[![CDNJS][cdnjs-image]][cdnjs-url]

```javascript
var box = document.createElement('div');
box.style.setProperty('background-color', '#008800');
box.style.setProperty('width', '100px');
box.style.setProperty('height', '100px');
document.body.appendChild(box);

// 设置循环动画
function animate(time) {
requestAnimationFrame(animate);
TWEEN.update(time);
}
requestAnimationFrame(animate);

var coords = { x: 0, y: 0 }; // 起始点 (0, 0)
var tween = new TWEEN.Tween(coords) // 创建一个新的tween用来改变 'coords'
.to({ x: 300, y: 200 }, 1000) // 在1s内移动至 (300, 200)
.easing(TWEEN.Easing.Quadratic.Out) // 使用缓动功能使的动画更加平滑
.onUpdate(function() { // 在 tween.js 更新 'coords' 后调用
// 将 'box' 移动到 'coords' 所描述的位置，配合 CSS 过渡
box.style.setProperty('transform', 'translate(' + coords.x + 'px, ' + coords.y + 'px)');
})
.start(); // 立即开始 tween
```

[在线代码测试](https://codepen.io/mikebolt/pen/zzzvZg)

## 安装

下载 [library](https://raw.githubusercontent.com/tweenjs/tween.js/master/src/Tween.js) 并将它引入至你的代码中:

```html
<script src="js/Tween.js"></script>
```

您也可以在代码中引用 CDN 托管的版本，这要感谢 cdnjs 。例如:

```html
<script src="https://cdnjs.cloudflare.com/ajax/libs/tween.js/16.3.5/Tween.min.js"></script>
```

See [tween.js](https://cdnjs.com/libraries/tween.js/) for more versions.

查看更多 [tween.js](https://cdnjs.com/libraries/tween.js/) 版本.

### 更多高级用户想要的...

#### 使用 `npm`

```bash
npm install @tweenjs/tween.js
```

然后用标准的 node.js `require` 包含 Tween.js 模块:

```javascript
var TWEEN = require('@tweenjs/tween.js');
```

您可以像所有其他示例一样使用Tween.js，例如:

```javascript
var t = new TWEEN.Tween( /* etc */ );
t.start();
```

你将需要使用诸如`browserify`之类的工具将使用此风格的代码转换为可以在浏览器中运行的代码(浏览器无法识别 `require`)

#### Use `bower`

```bash
bower install @tweenjs/tweenjs --save
```

或者安装特定的tag.他们是git tags,如果你已经在本地克隆仓库，你可以在命令行中运行`git tag`查看tag列表,或者你可以查看下 [tween.js tags page](https://github.com/tweenjs/tween.js/tags) 列表.例如,安装 `v16.3.0`:

```bash
bower install @tweenjs/tweenjs#v16.3.0
```

然后引入库源码:

```html
<script src="bower_components/@tweenjs/tweenjs/src/Tween.js"></script>
```

## Features

* 只做一件事且仅只做一件事: 补间特性
* 不关注CSS单位 (e.g. appending `px`)
* 不插入颜色
* 缓和功能可以在Tween之外重用
* 也可以使用自定义缓动功能

## Documentation

* [使用指南](./docs/user_guide_zh-CN.md)
* [贡献者指南](./docs/contributor_guide_zh-CN.md)
* [教程](http://learningthreejs.com/blog/2011/08/17/tweenjs-for-smooth-animation/) using tween.js with three.js
* 其他: [libtween](https://github.com/jsm174/libtween), [jsm174](https://github.com/jsm174) 写的一个C语言版本的 tween.js.
* 其他: [es6-tween](https://github.com/tweenjs/es6-tween), [dalisoft](https://github.com/dalisoft) 写的一个ES6/Harmony版本的 tween.js.
* [理解 tween.js](https://mikebolt.me/article/understanding-tweenjs.html)

## 示例

<table>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/12_graphs_custom_functions.html">
<img src="./assets/examples/03_graphs.png" alt="Custom functions" />
</a>
</td>
<td>
Custom functions<br />
(<a href="examples/12_graphs_custom_functions.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/11_stop_all_chained_tweens.html">
<img src="./assets/examples/11_stop_all_chained_tweens.png" alt="Stop all chained tweens" />
</a>
</td>
<td>
Stop all chained tweens<br />
(<a href="examples/11_stop_all_chained_tweens.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/10_yoyo.html">
<img src="./assets/examples/10_yoyo.png" alt="Yoyo" />
</a>
</td>
<td>
Yoyo<br />
(<a href="examples/10_yoyo.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/09_relative_values.html">
<img src="./assets/examples/09_relative.png" alt="Relative values" />
</a>
</td>
<td>
Relative values<br />
(<a href="examples/09_relative_values.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/08_repeat.html">
<img src="./assets/examples/08_repeat.png" alt="Repeat" />
</a>
</td>
<td>
Repeat<br />
(<a href="examples/08_repeat.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/07_dynamic_to.html">
<img src="./assets/examples/07_dynamic_to.png" alt="Dynamic to" />
</a>
</td>
<td>
Dynamic to<br />
(<a href="examples/07_dynamic_to.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/06_array_interpolation.html">
<img src="./assets/examples/03_graphs.png" alt="Array interpolation" />
</a>
</td>
<td>
Array interpolation<br />
(<a href="examples/06_array_interpolation.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/05_video_and_time.html">
<img src="./assets/examples/06_video_and_time.png" alt="Video and time" />
</a>
</td>
<td>
Video and time<br />
(<a href="examples/05_video_and_time.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/04_simplest.html">
<img src="./assets/examples/04_simplest.png" alt="Simplest possible example" />
</a>
</td>
<td>
Simplest possible example<br />
(<a href="examples/04_simplest.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/03_graphs.html">
<img src="./assets/examples/03_graphs.png" alt="Graphs" />
</a>
</td>
<td>
Graphs<br />
(<a href="examples/03_graphs.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/02_black_and_red.html">
<img src="./assets/examples/02_black_and_red.png" alt="Black and red" />
</a>
</td>
<td>
Black and red<br />
(<a href="examples/02_black_and_red.html">source</a>)
</td>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/01_bars.html">
<img src="./assets/examples/01_bars.png" alt="Bars" />
</a>
</td>
<td>
Bars<br />
(<a href="examples/01_bars.html">source</a>)
</td>
</tr>
<tr>
<td>
<a href="http://tweenjs.github.io/tween.js/examples/00_hello_world.html">
<img src="./assets/examples/00_hello_world.png" alt="hello world" />
</a>
</td>
<td>
hello world<br />
(<a href="examples/00_hello_world.html">source</a>)
</td>
</tr>
</table>

## Tests

你首先需要安装`npm`--基于node.js,所以首先安装它.然后,进入到`tween.js`的目录下并运行:

```bash
npm install
```

如果是第一次运行测试,则为运行测试安装额外的依赖,然后运行

```bash
npm test
```

每次你想运行测试.

如果你想添加任何功能或改变现有的功能，你*必须*运行测试，以确保你没有影响别的东西.如果你发一个pull request（PR）添加新的东西,它没有测试,或测试不通过,这个PR将不被接受.更详细的请看 [contributing](CONTRIBUTING.md).

## People

维护者: [mikebolt](https://github.com/mikebolt), [sole](https://github.com/sole).

[所有贡献者](http://github.com/tweenjs/tween.js/contributors).

## 使用 tween.js 的项目

[![A-Frame VR](http://tweenjs.github.io/tween.js/assets/projects/10_aframe.png)](https://aframe.io)
[![MOMA Inventing Abstraction 1910-1925](http://tweenjs.github.io/tween.js/assets/projects/09_moma.png)](http://www.moma.org/interactives/exhibitions/2012/inventingabstraction/)
[![Web Lab](http://tweenjs.github.io/tween.js/assets/projects/08_web_lab.png)](http://www.chromeweblab.com/)
[![MACCHINA I](http://tweenjs.github.io/tween.js/assets/projects/07_macchina.png)](http://5013.es/toys/macchina)
[![Minesweeper 3D](http://tweenjs.github.io/tween.js/assets/projects/06_minesweeper3d.png)](http://egraether.com/mine3d/)
[![ROME](http://tweenjs.github.io/tween.js/assets/projects/05_rome.png)](http://ro.me)
[![WebGL Globe](http://tweenjs.github.io/tween.js/assets/projects/04_webgl_globe.png)](http://data-arts.appspot.com/globe)
[![Androidify](http://tweenjs.github.io/tween.js/assets/projects/03_androidify.png)](http://www.androidify.com/)
[![The Wilderness Downtown](http://tweenjs.github.io/tween.js/assets/projects/01_wilderness.png)](http://thewildernessdowntown.com/)
[![Linechart](http://tweenjs.github.io/tween.js/assets/projects/00_linechart.png)](http://dejavis.org/linechart)

[npm-image]: https://img.shields.io/npm/v/@tweenjs/tween.js.svg
[npm-url]: https://npmjs.org/package/@tweenjs/tween.js
[downloads-image]: https://img.shields.io/npm/dm/@tweenjs/tween.js.svg
[downloads-url]: https://npmjs.org/package/@tweenjs/tween.js
[travis-image]: https://travis-ci.org/tweenjs/tween.js.svg?branch=master
[travis-url]: https://travis-ci.org/tweenjs/tween.js
[flattr-image]: https://api.flattr.com/button/flattr-badge-large.png
[flattr-url]: https://flattr.com/thing/45014/tween-js
[cdnjs-image]: https://img.shields.io/cdnjs/v/tween.js.svg
[cdnjs-url]: https://cdnjs.com/libraries/tween.js

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