请问对吗？
来源：3-16 编程练习
神知
2021-01-06 16:52:37
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>字符串</title>
</head>
<body>
<script>
var str = "Never deter till tomorrow that which you can do today";
// 补充代码
var str1=str.indexOf('tomorrow');
var str2=str.substring(str1,str1+8);
var str3= str2.toUpperCase(str2);
var str4= "Never deter till "+str3+" that which you can do today";
console.log(str4);
</script>
</body>
</html>
写回答
1回答
-
好帮手慕张
2021-01-06
同学你好，代码效果正确，由于toUpperCase方法中即使传递了参数也会被忽略，建议优化：去掉传递的参数str2，让代码更加规范
祝学习愉快！
0
