html运行实例（eg_js_timing_setinterval_clearinterval

代码示例：（标识：eg_js_timing_setinterval_clearinterval_1）

<!DOCTYPE html>
<html>
<body>

<p>此页面上的脚本启动这个时钟：</p>

<p id="demo"></p>

<button onclick="clearInterval(myVar)">停止时间</button>

<script>
var myVar = setInterval(myTimer ,1000);
function myTimer() {
  var d = new Date();
  document.getElementById("demo").innerHTML = d.toLocaleTimeString();
}
</script>

</body>
</html>