引入js文件

<script type="text/javascript" src="js/three.min.js"></script> 
<script type="text/javascript" src="js/dat.gui.min.js"></script>
<script type="text/javascript" src="js/Stats.min.js"></script>
<script src='js/jquery.min.js'></script>
<script src="js/index.js"></script>