在vue项目中给div设置了contenteditable=true属性，求教下限制只能输入数字怎么写

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>只能输入数字</title>
  <style>
    .demo {
      width: 400px;
      height: 250px;
      border:green solid 1px;
    }
  </style>
</head>
<body>  
  <div id="editor" class="demo" contenteditable=true></div>
  <script>
    document.getElementById('editor').oninput = function () {
      this.innerHTML = this.innerHTML.replace(/[\D]/g, '')
      keepLastIndex(this)
    }
    function keepLastIndex(obj) {
      if (window.getSelection) {
        obj.focus();
        var range = window.getSelection();
        range.selectAllChildren(obj);
        range.collapseToEnd();
      }
      else if (document.selection) {
        var range = document.selection.createRange();
        range.moveToElementText(obj);
        range.collapse(false);
        range.select();
      }
    }
  </script>
</body>
</html>

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