<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
var a=12;</script>
var b=12;
console.log(a==b); //先轉換類型,然後比較
console.log(a===b); //不轉換類型,直接比較
console.log(a+b); //+加號兩邊都是數字時,運算加法,否則爲連接字符的意思
</head>
<body>
</body>
</html>