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>
<script src="./fill.js">
</script>
</body>
</html>
JS
var num1 = prompt("第一个数是","")
var num2 = prompt("第二个数是","")
var num3 = prompt("第三个数是","")
var num4 = prompt("第四个数是","")
var num5 = prompt("第五个数是","")
var NUM = [num1,num2,num3,num4,num5];
var bigvalue = [0];
for (var i=1;i<NUM.length;i++){
if(NUM[i]>bigvalue){
bigvalue = NUM[i];
}
}
document.write('最大数为'+bigvalue);