无法在localStorage中保存2个以上的项目

function getLocalStorageUsage() {
    let total = 0;
    for (let key in window.localStorage) {
        if (window.localStorage.hasOwnProperty(key)) {
            total += window.localStorage[key].length * 2 / 1024; // 每个字符2字节
        }
    }
    return total.toFixed(2) + ' KB';
}

console.log('Current localStorage usage: ' + getLocalStorageUsage());

function saveToLocalStorage(keyPrefix, data) {
    const uniqueKey = keyPrefix + Date.now();
    localStorage.setItem(uniqueKey, JSON.stringify(data));
}

function getFromLocalStorage(keyPrefix) {
    for (let i = 0; i < localStorage.length; i++) {
        const key = localStorage.key(i);
        if (key.startsWith(keyPrefix)) {
            return JSON.parse(localStorage.getItem(key));
        }
    }
    return null;
}

function saveToLocalStorage(key, data) {
    try {
        localStorage.setItem(key, JSON.stringify(data));
    } catch (e) {
        console.error('Failed to save to localStorage:', e);
        // 处理异常，例如提示用户清理存储空间
    }
}

function saveMultipleItems(items) {
    for (let i = 0; i < items.length; i++) {
        const key = 'item_' + i;
        console.log(`Saving item with key: ${key}`);
        try {
            localStorage.setItem(key, JSON.stringify(items[i]));
        } catch (e) {
            console.error(`Failed to save item with key: ${key}`, e);
        }
    }
}