本文提供了一个简单的JavaScript排序算法示例，通过比较和交换的方式对四个变量进行排序，并输出排序后的结果。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
var a = 3,
b = 5,
c = 1,
d = -1,
temp;
if (a > b) {
temp = a;
a = b;
b = temp;
}
if (b > c) {
temp = b;
b = c;
c = temp;
}
if (c > d) {
temp = c;
c = d;
d = temp
}
if (a > c) {
temp = a;
a = c;
c = temp;
}
console.log(a, b, c, d)
</script>
</body>
</html>
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