我需要进行AJAX调用并返回其数据。当它成功时，它应循环遍历每个数据并为每次迭代运行另一个AJAX函数。
问题是某些行是异步跳过的，所以它会向下一个依赖它的AJAX发送不同的数据。我在代码中添加了一个注释错误的地方。
var total_sections_num;
var question_arr;
var section_arr;
function populateCreateSurvey(){
$.ajax({
type: 'get',
url: "{{ url('importsurvey') }}",
data: { survey_id: selected_survey },
success:function(data){
question_arr = [[],[]];
section_arr= [];
$(data).each(function(item, value){
$('#survey_title').val(value.name);
var selected_survey_id = value.survey_id;
$.ajax({
type: 'get',
url: "{{ url('importsections') }}",
data: { survey_id: selected_survey_id },
success:function(data){
total_sections_num = 0;
$(data).each(function(item,value){
section_arr[total_sections_num++] = value.title;
var section_id = value.section_id;
$.ajax({
type: 'get',
url: "{{ url('importquestions') }}",
data: { section_id: section_id },
success:function(data){
if (!(data.length ===0)){
var i = 0;
question_arr[total_sections_num] = [];
$(data).each(function(item,value){
//here is where it doesn't work as how it's supposed to. Once it gets here, total_sections_num's value is already 2 when it's supposed to be 1 first.
question_arr[total_sections_num][i++] = value.content;
});
}
}
});
});
}
});
});
}
});
}