var promises = [
    $http.get('/api/data1'),
    $http.get('/api/data2'),
    $http.get('/api/data3')
];

$q.all(promises)
    .then(function(responses) {
        // 所有请求都已完成
        var data1 = responses[0].data;
        var data2 = responses[1].data;
        var data3 = responses[2].data;
        // 处理数据...
    })
    .catch(function(error) {
        // 任一请求失败
        console.error('请求失败:', error);
    });

async function fetchAllData() {
    try {
        const [data1, data2, data3] = await Promise.all([
            $http.get('/api/data1').then(r => r.data),
            $http.get('/api/data2').then(r => r.data),
            $http.get('/api/data3').then(r => r.data)
        ]);
        // 所有数据都已获取
    } catch (error) {
        console.error('请求失败:', error);
    }
}

var totalRequests = 3;
var completedRequests = 0;
var results = [];

function checkCompletion() {
    if (completedRequests === totalRequests) {
        // 所有请求完成
    }
}

$http.get('/api/data1').then(function(response) {
    results[0] = response.data;
    completedRequests++;
    checkCompletion();
});

$http.get('/api/data2').then(function(response) {
    results[1] = response.data;
    completedRequests++;
    checkCompletion();
});

$http.get('/api/data3').then(function(response) {
    results[2] = response.data;
    completedRequests++;
    checkCompletion();
});