这两段代码展示了如何使用JavaScript将一个大的数字（例如7896709887）转换成天数、小时数、分钟数和秒数。方法一是通过逐步计算各个单位，方法二是利用取模和除法同时进行计算。
方法一
<!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>
</body>
<script>
var num = 7896709887
var day = parseInt(num / 86400)
console.log(day+"天")
var hours = parseInt((num-day*86400)/3600)
console.log(hours+"小时")
var second = parseInt(((num-day*86400)-hours*3600)/60)
console.log(second+"分")
var miao = parseInt(num%60)
console.log(miao+"秒")
</script>
</html>
方法二
<!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>
</body>
<script>
var num = 7896709887
var day = parseInt(num / 86400)
var hours = parseInt(num /3600)%24
var second = parseInt(num/60)%60
var miao = parseInt(num%60)
console.log(day,hours,second,miao )
</script>
</html>
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