js 清除缓存加随机数

<script>
    document.write("<s"+"cript type='text/javascript' src='./js/myJs/checke.js?"+Math.random()+"'></scr"+"ipt>");
    document.write("<s"+"cript type='text/javascript' src='./js/myJs/common.js?"+Math.random()+"'></scr"+"ipt>");
</script>