问题

我需要检查条件，如果字符串中包含介于1和7之间（包括1和7），则返回true，否则返回false。

我的代码如下：

const [cartOptions, setCartOptions] = useState(null);

useEffect(() => {
  if (trolleyName) {
    trolleyFinder(trolleyName);
  }
}, [trolleyName]);

const trolleyFinder = (trolleyName) => {
  if (
    trolleyName &&
    (trolleyName.includes("1") ||
      trolleyName.includes("2") ||
      trolleyName.includes("3") ||
      trolleyName.includes("4") ||
      trolleyName.includes("5") ||
      trolleyName.includes("6") ||
      trolleyName.includes("7"))
  ) {
    setCartOptions("1");
  } else {
    setCartOptions("2");
  }
};

在这段代码中，我们检查了trolleyName是否包含数字1到7中的任何一个，如果包含则将cartOptions设置为"1"，否则设置为"2"。

请注意，这段代码应该正常工作，但如果您没有得到预期的结果，可能需要检查一下trolleyName的值是否正确或其他相关代码是否有问题。

const [cartOptions,setCartOptions]=useState(null);
useEffect(() => {

  if(trolleyName){
    trolleyFinder(trolleyName);
  }
}, [trolleyName])

const trolleyFinder=(trolleyName)=>{
if(trolleyName&&trolleyName.includes("1"||"2"||"3"||"4"||"5"||"6"||"7")){
  setCartOptions("1")
}
else{
  setCartOptions("2")
}
}

答案1

得分: 0

trolleyName.includes("1" || "2" || "3" || "4" || "5" || "6" || "7")

这段代码不会起作用，因为 || 运算符会计算并返回遇到的第一个真值，而在这种情况下是 1。所以你的代码与 trolleyName.includes("1") 相同。

要检查一个字符串是否包含某个特定范围内的数字（在这种情况下是1-7），你可以使用正则表达式的 .test() 方法，检查是否匹配 1-7 之间的数字：

if (trolleyName && /Galley[1-7]$/.test(trolleyName))

这里的 Galley[1-7]$ 表示匹配文本 "Galley" 后面跟着1到7之间的数字（然后是字符串的结尾 $）。

话虽如此，如果你完全控制 trolleyName，我建议将其制作成一个包含数字作为单独属性的对象。这样，你可以直接针对该属性进行检查。此外，正如@Wimanicesir建议的那样，如果你最终使用了一个对象，你可以设置 cartOption 值，这样你就不需要担心条件判断了。

<details>
<summary>英文:</summary>

```js
trolleyName.includes(&quot;1&quot;||&quot;2&quot;||&quot;3&quot;||&quot;4&quot;||&quot;5&quot;||&quot;6&quot;||&quot;7&quot;)

This won't work because the || operator evaluates to the first truthy value it comes across, which in this case is "1". So your code is the same as doing trolleyName.includes("1")

To check if a string contains a number between a certain range (in this case 1-7) you can use .test() on a regular expression, that checks for numbers between 1-7:

if(trolleyName && /Galley[1-7]$/.test(trolleyName))

Here Galley[1-7]$ means match against the text "Galley" followed by numbers between 1 and 7 inclusive (and then the end of the string $).

With that being said, if you have full control over trolleyName, I suggest making it an object that contains the number as a separate property. That way you can easily check against this property directly. Furthermore, as @Wimanicesir suggests, if you end up using an object, you can set the cartOption value, which then means you don't need to worry about your conditional.