<!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>百度</button>
    <button id="btn2">取消百度</button>
</body>
<script>
    var baidu;
    document.querySelector("button").onclick=function(){
        baidu=window.setTimeout(function(){
            baidu=window.open("https://www.baidu.com")
        },5000)
       
    }
    document.querySelector("#btn2").onclick=function(){
      window.clearTimeout(baidu)
        }
</script>
</html>

 效果

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