js定制器启动与停止

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<script type="text/javascript">

	//定时执行的函数
	function demo(){
		console.log("demo");
	}
	
	//定义定时器(调用函数不加()),此代码执行之后,定时器已启动
	var demo_interval = setInterval(demo, 1000); 
	
	//停止
	clearInterval(demo_interval);
	
	//再次启动
	demo_interval = setInterval(demo, 1000);

</script>

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