var bc = require('bili-convert');
console.log(bc.btoa(170001));//17x411w7KC
console.log(bc.atob('17x411w7KC'));//170001
<script src="/js/bili-convert/lli.js"></script>
<script src="/js/bili-convert/index.js"></script>
<script>
console.log(bc.btoa(170001));//17x411w7KC
console.log(bc.atob('17x411w7KC'));//170001
</script>