Cannot use 'T' as reified type parameter. Use a class instead.

为啥会报这个错呢

function getStorage<T>(key: string): T | null {  
    let parseObj: T | null = null  
    const storageValue: string = uni.getStorageSync(key) as string  
    if (storageValue != null) {  
        parseObj = JSON.parse<T>(storageValue)  
    }  
    return parseObj  
}