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"use strict";
//嚴格模式
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>無標題文檔</title>
</head>
<body>
<script>
"use strict";
(function() {
var a = b = 5;
})();
//這個會報錯哦;
console.log(b);
</script>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>無標題文檔</title>
</head>
<body>
<script>
(function() {
var a = b = 5;
})();
//這個居然跑出來一個5,尼瑪!!
console.log(b);
</script>
</body>
</html>
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