$.ajax({
    url: '/api/endpoint',
    type: 'POST',
    contentType: 'application/json', // 明确指定内容类型
    data: JSON.stringify({key: 'value'}), // 确保数据是JSON字符串
    success: function(response) {
        console.log(response);
    },
    error: function(xhr, status, error) {
        console.error(error);
    }
});

$.ajax({
    url: '/api/endpoint',
    type: 'POST',
    data: {
        requiredParam1: 'value1',
        requiredParam2: 'value2'
    },
    success: function(response) {
        console.log(response);
    }
});

let paramValue = $('#inputField').val();
if(!isValid(paramValue)) {
    alert('请输入有效值');
    return;
}

$.ajax({
    url: '/api/endpoint',
    data: { param: paramValue },
    success: function(response) {
        console.log(response);
    }
});

$.ajax({
    url: 'http://otherdomain.com/api',
    dataType: 'jsonp', // 仅当服务器支持时
    success: function(response) {
        console.log(response);
    }
});

$.ajax({
    url: '/api/endpoint',
    headers: {
        'Authorization': 'Bearer ' + token,
        'X-Custom-Header': 'value'
    },
    success: function(response) {
        console.log(response);
    }
});