请问对吗？
来源：3-16 编程练习
神知
2021-10-30 23:27:44
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>javascript练习</title>
</head>
<body>
<script>
var str="Never deter till tomorrow that which you can do today";
var str_1=str.substring(17,25);
console.log(str_1);
str_2=str_1.toUpperCase();
console.log("Never deter till "+str_2+" that which you can do today");
</script>
</body>
</html>
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1回答
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好帮手慕慕子
2021-10-31
同学你好，效果实现是对的，继续加油，祝学习愉快~
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