如何读取对象中值的长度？

Question

我的代码如下：

const minLocationLength = 1;
        if (location.description.length < minLocationLength) {
          reject(`Location must be at least ${minLocationLength} characters.`);
        }

我收到错误Cannot read property 'length' of undefined。我做得对吗？

Answer 1

未定义描述的值，您应首先检查：

 if (location.description && location.description.length < minLocationLength) {
          reject(`Location must be at least ${minLocationLength} characters.`);
        }