场景：
如何得到正在执行的script元素？
"新"货色：
document.currentScript;
来源：
- 非标准，适用在Gecko 2.0+（FF4+）
- 返回当前正在执行的<script>元素
应用：
获取当前执行的script是否异步执行
if(document.currentScript.async){
//异步
}else{
//同步
}
在线例子：
----- 注意请用ff4+查看！！！
扩展阅读：
https://github.com/seajs/seajs/issues/468
https://developer.mozilla.org/en-US/docs/DOM/document.currentScript
https://developer.mozilla.org/zh-CN/docs/DOM/document.currentScript
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