// 请求1
$.ajax({
  url: 'api/data1',
  success: function(data) {
    console.log('Data1 received:', data);
  }
});

// 请求2
$.ajax({
  url: 'api/data2',
  success: function(data) {
    console.log('Data2 received:', data);
  }
});

$.when(
  $.ajax('api/data1'),
  $.ajax('api/data2')
).then(function(response1, response2) {
  console.log('Both requests completed');
  console.log('Response1:', response1[0]);
  console.log('Response2:', response2[0]);
});

Promise.all([
  $.ajax('api/data1'),
  $.ajax('api/data2')
]).then(function(responses) {
  console.log('All responses:', responses);
});

$.when(
  $.ajax('api/data1').fail(function() { console.log('Request1 failed'); }),
  $.ajax('api/data2').fail(function() { console.log('Request2 failed'); })
).then(function() {
  console.log('All successful or some failed but handled');
});