// 将JSON对象转换为查询字符串
function jsonToQueryString(json) {
    return '?' + Object.keys(json).map(key => {
        return encodeURIComponent(key) + '=' + encodeURIComponent(json[key]);
    }).join('&');
}

const params = {name: "John", age: 30};
const queryString = jsonToQueryString(params);

fetch(`/api/user${queryString}`)
    .then(response => response.json())
    .then(data => console.log(data));

const data = {username: 'example', password: '123456'};

fetch('/api/login', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json',
    },
    body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

$.ajax({
    url: '/api/data',
    type: 'POST',
    contentType: 'application/json',
    data: JSON.stringify({key1: 'value1', key2: 'value2'}),
    success: function(response) {
        console.log(response);
    },
    error: function(xhr, status, error) {
        console.error(error);
    }
});

try {
    const data = JSON.parse(response);
} catch (e) {
    console.error('Invalid JSON:', e);
}