$.ajax({
    url: '/api/endpoint',
    type: 'POST',
    data: { key: 'value' },
    dataType: 'json',
    success: function(response) {
        // 先检查response是否存在
        if (!response) {
            console.error('Empty response received');
            return;
        }
        
        // 检查特定属性是否存在
        if (response.hasOwnProperty('expectedProperty')) {
            console.log(response.expectedProperty);
        } else {
            console.error('expectedProperty not found in response');
        }
    },
    error: function(xhr, status, error) {
        console.error('Request failed:', status, error);
    }
});

// 使用可选链防止报错
const value = response?.data?.property?.subProperty || 'default';

try {
    const response = await fetch('/api/endpoint', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ key: 'value' })
    });
    
    const data = await response.json();
    
    if (!data) throw new Error('No data returned');
    
    // 安全访问嵌套属性
    const result = data && data.nested && data.nested.property;
    
} catch (error) {
    console.error('Error:', error);
}

const safeData = response || {};
const value = safeData.property || 'default';