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<form>
	<input type="radio" name="fruit" value="apple" />苹果
	<input type="radio" name="fruit" value="banana" checked />香蕉
	<input type="radio" name="fruit" value="pear" />梨

	<input type="checkbox" name="level" value="1" /><span>1</span>
	<input type="checkbox" name="level" value="2" /><span>2</span>
	<input type="checkbox" name="level" value="3" checked /><span>3</span>
	<input type="checkbox" name="level" value="4" /><span>4</span>
	<input type="checkbox" name="level" value="5" checked /><span>5</span>
</form>

<script>
  window.onload = function () {
    var obj = document.getElementsByName('fruit')
    for (var i = 0; i < obj.length; i++) {
      if (obj[i].checked) {
        console.log(obj[i].value)
      }
    }
  }

  var checkboxObj = document.getElementsByName('level')
  check_val = []
  for (k in checkboxObj) {
    if (checkboxObj[k].checked) {
      check_val.push(checkboxObj[k].value)
    }
  }
  console.log(check_val)
</script>