js saves json data locally

<script src="https://cdn.bootcss.com/FileSaver.js/2014-11-29/FileSaver.js"></script>
<input type="button" id="export" value="保存"/>
 
<script>
 var button = document.getElementById("export");
 button.addEventListener("click", saveHandler, false);
 function saveHandler(){
      let data = {
          name:"hanmeimei",
          age:88
      }
      var content = JSON.stringify(data);
      var blob = new Blob([content], {type: "text/plain;charset=utf-8"});
      saveAs(blob, "save.json");
 }
 
</script>