解决 'Cannot read property 'split' of undefined' 错误: TypeScript 中处理 undefined 变量

The error message 'Cannot read property 'split' of undefined' means that the variable 'panelId' is undefined and you are trying to access the 'split' method on it.

To fix this error, make sure that the 'panelId' variable is defined and has a value before trying to split it. You can do this by checking if the variable is undefined before attempting to split it.

Here's an example fix:

const panelId: string | undefined = inputs.panelId;
let orderno: string;

if (panelId) {
  orderno = panelId.split('-')[0];
} else {
  orderno = ''; // or any default value you want to assign
}

This code checks if 'panelId' is defined before splitting it. If it is defined, the 'split' method is called as before. If 'panelId' is undefined, we assign an empty string (or any default value you prefer) to 'orderno'.