<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="text" id="tx1" value="4396" maxlength="4">
<input type="button" id="but" value="开始加密">
<input type="text" id="tx2" disabled>
</body>
<script>
var txt1 = document.getElementById("tx1");
var txt2 = document.getElementById("tx2");
var btn = document.getElementById("but");
btn.onclick = function () {
if (isNaN(txt1.value)) {
txt2.value = "无法加密您输入的内容！";
} else {
var q = txt1.value;
txt2.value = jiami(q);
}
}
function jiami(z) {
var i = 5;
var a = parseInt(((z / 1000) + i) % 10);
var b = parseInt((((z % 1000) / 100) + i) % 10);
var c = parseInt((((z % 100) / 10) + i) % 10);
var d = parseInt(((z % 10) + i) % 10);
toString
return "加密后为：" + ("" + d + c + b + a);
}
</script>
</html>
