<!–引入外部文件的方式–>
<script type=”text/javascript” src=”attack.js”></script>
 
//attack.js 代码
function attackEnemy() {
document.write("land on");
alert("ready go");
}

 

参考：

https://blog.csdn.net/u012871987/article/details/72638373/

http://www.fly63.com/article/detial/1183

https://www.cnblogs.com/miaoying/p/8337613.html

 

 

 

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