语法错误：意外的令牌

Question

这里是新手程序员！

我在 codeacademy.org 上学习并不断收到此错误，即使我很确定它已正确编写。帮忙？

// Declare a variable on line 3 called
// myCountry and give it a string value.
var myCountry = "Panama";
// Use console.log to print out the length of the variable myCountry.
console.log(.length myCountry);

// Use console.log to print out the first three letters of myCountry.
console.log(myCountry .subscript(0,3));

Answer 1

你的例子有两个问题：

console.log(.length myCountry)

不是有效的Javascript；你需要

console.log(myCountry.length)

（length 是变量myCountry 的属性）。

另外，subscript 不是 JS 函数，你需要substring。

完整示例：

// Declare a variable on line 3 called
// myCountry and give it a string value.
var myCountry = "Panama";
// Use console.log to print out the length of the variable myCountry.
console.log(myCountry.length);

// Use console.log to print out the first three letters of myCountry.
console.log(myCountry.substring(0, 3));

Answer 2

这是正确的答案

var myCountry = "myCountry";
console.log("myCountry".length);


var myCountry = "myCountry";
console.log("myCountry".substring(0,3) );