<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<button οnclick="commit()">确定</button>
</body>
<script>
function commit() {
var num = 90
var a=''
for (var i = 2; i <= num; i++) {
if (num % i === 0) {
num = num / i
a= a + '' + i
i = 1
}
}
(a)
}