lovecoding
/
VIP22


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button id="btn">清除</button>
  <script>
    var btn = document.getElementById('btn')
    /* 第一种 settimeout   毫秒为单位   只执行一次*/

    var a = setTimeout(function(){
      console.log('哈哈哈')
    },1000)

    /* 第二种 setInterval  一直执行*/
    // var b = setInterval(function(){
    //   console.log('hahhaha ')
    // },1000)
    btn.onclick = function(){
      // clearInterval(b)
      clearTimeout(a)
    }
  </script>
</body>
</html>