abstract：<!DOCTYPE html><html><head><title>javascript基礎(chǔ)</title><!-- <script type="text/javascript">document.write('javascript的基礎(chǔ)語')</script> -->
<!DOCTYPE html>
<html>
<head>
<title>javascript基礎(chǔ)</title>
<!-- <script type="text/javascript">document.write('javascript的基礎(chǔ)語')</script> -->
</head>
<body>
<script type="text/javascript">
//*document.write('javascript的基礎(chǔ)')*//
var y=5,x=10;
z=x-y
document.write(z)
</script>
</body>
</html>
Correcting teacher：天蓬老師Correction time：2019-06-03 10:25:27
Teacher's summary：var y=5,x=10;
z=x-y
document.write(z)
這個代碼有2個問題.
1. 會自動創(chuàng)建全局變量z;
2. 應(yīng)該將結(jié)果輸出到控制吧查看