eleFixed

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Let element fixed. Like table's thead fixed

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## 介绍

eleFixed是一款非常简单的使用动画来固定元素的插件（最常见的作用就是固定table的thead）

它可以同时固定多个HTMLElement而不用额外监听多个事件，而且你也可以随时删除某一个监听对象或者直接把eleFixed从你的网页中移除

## 使用

当你引入eleFixed.js的时候，它就已经帮你在全局定义好了eleFixed对象并监听scroll事件（仅仅一个）；

##### eleFixed.push需要传入的对象（targrt）描述：

target对象 | 描述
--- |---
target | HTMLElement，接收你想固定的元素，比如 document.getElementsByTagName('thead')[0]
offsetTop | Number，此元素距离顶部多少像素时开始固定在顶部， 比如 200 (无需单位)

##### 插入target:

```html
    <table class="table">
        <thead>
            
        </thead>
        <tbody>
            
        </tbody>
    </table>
    <script src="./eleFixed.min.js"></script>
    <script>
        // add an instance
        eleFixed.push({
            target: document.getElementsByTagName('thead')[0], // it must be a HTMLElement
            offsetTop: 210 // height from window offsetTop
        })
    </script>
```

##### 效果预览：
![image](https://raw.githubusercontent.com/KenyeeC/eleFixed/master/demo.gif)

##### 删除元素:
```html
<script>
    // delete an instance
    eleFixed.delete(document.getElementsByTagName('thead')[0])
</script>
```

##### 移除eleFixed:
```html
<script>
    // destory eleFixed
    eleFixed.destory()
</script>
```

eleFixed

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eleFixed

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