JavaScript数组相减实现：从数组a中移除与数组b相同的元素

<!DOCTYPE html>
<html>
<head>
    <title>js数组相减</title>
</head>
<body>
<script type="text/javascript">
  function arrChange( a, b ){
   for (var i = 0; i < b.length; i++) {
    for (var j = 0; j < a.length; j++) {
     if (a[ j ] == b[ i ]) {//如果是id相同的，那么a[ j ].id == b[ i ].id
      a.splice(j, 1);
      j = j - 1;
     }
    }
   }
   return a;
  }
  var a=[1,2,3,4,5,6,7,8]
  var b=[4,5,6,7,8,9,10]
  debugger
  arrChange(a,b)
  console.log(a)//[1, 2, 3]
</script>
</body>
</html>