​x
 
<!DOCTYPE html>
<html>
<body>
​
时间：<input type="time" id="myTime" step="5">
​
<p>单击该按钮可显示时间字段（秒间隔）的 step 属性的值。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myTime").step;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​