设置定时器的时候，会在window下挂载一个属性
    clearInter

    1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    6.     <title>Document</title>
    7. </head>
    8. <body>
    9.     <button id="btn">停止定时器</button>
    10.     <script>
    11.         // 设置定时器的时候，会在window下挂载一个属性
    12.         // clearInter
    13.         var btn = document.getElementById("btn");
    14.         var temp = setInterval(function(){
    15.             console.log("2")
    16.         },1000)
    17.         btn.onclick = function(){
    18.             console.log(temp)
    19.         }
    21.     </script>
    22. </body>
    23. </html>

    1.PNG