es6 let const 

<script type="text/javascript">
    const a=2;
    console.log(a)
    a=13;
    console.log(a)

</script>

 

posted @ 2020-07-26 10:16  爱跑步的乌龟  阅读(76)  评论(0)  编辑  收藏  举报