<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> if...else </title>
<script type="text/javascript">
var money = window.prompt ("请输入你充值的Q币")
money = parseFloat(money);
if (money < 10000)
{
window.alert ("你的充值小于下限");
}else{
window.alert ("充值成功");
}
</script>
</head>
<body>
</body>
</html>
j1.png
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