async function calculatorImmediateAnnuity() {
    
    
    let url = 'https://openapi.explinks.com/您的username/v1/calculator_immediate_annuity/saf202509205392241dbfa3';
    
    const options = {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'x-mce-signature': 'AppCode/{您的Apikey}'
            // AppCode是常量,不用修改； Apikey在‘控制台 -->API KEYs --> 选择’API应用场景‘，复制API key
        },
        body: {"withdrawalLength":0,"initialInvestment":0,"paymentFrequency":"monthly","expectedReturnRate":0}
    };
    
    try {
        const response = await fetch(url, options);
        const data = await response.json();
        
        console.log('状态码:', response.status);
        console.log('响应数据:', data);
        
        return data;
    } catch (error) {
        console.error('请求失败:', error);
        throw error;
    }
}

// 使用示例
calculatorImmediateAnnuity()
    .then(result => console.log('成功:', result))
    .catch(error => console.error('错误:', error));