js面试题--------JS中数字和字符,布尔类型相加相减问题

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JS中数字和字符相加相减问题

<html lang="en">
<head>
<meta charset="utf-8" />
<title></title></head>
<body>
</body>
</html>
<script type="text/javascript">
var a = 100;
var b = "100";
alert(b- a);
alert(typeof (b- a));
alert(a + b - a);
alert(typeof (a + b - a));
alert(a + b);
alert(typeof (a + b));
alert(a + b - b);
alert(typeof (a + b - b));
alert(a + b - b - b);
alert(typeof (a + b - b - b));