基本语法入门，必备调试技巧
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script>//js严格区分大小写//1.定义变量//var num=1;//alert(num);//2.条件控制var score=71;if(score>60 && score<70){alert("60~70");}else if (score>70 && score<80){alert("70~80")}else{alert("other")}console.log(score)</script>
</head>
<body></body>
</html>
也可以在下面手动输入
