<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>变量、作用域</title>
</head>
<body>
<script type="text/javascript">
var a = 3, b = 4;
/*此处写代码*/
a = a + b;
console.log(a)
b = a - b;
console.log(b)
a = a - b;
console.log(a)
</script>
</body>
</html>
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