我有这个JSON数据，我根据用户输入动态更新数据。我的问题是为什么我必须在存储数据时初始化一个空的字典变量？
因为当我初始化它时，它只会覆盖该特定键的所有值的数据。我在谈论代码是这样的：
function updateThirdLayer() {
_data = global_json_data;
$.each(_data, function(key1, value1) {
if (key1 == 'questions') {
$.each(value1, function(key2, value2) {
if (value2["choices_qty"] > 1) {
choices = {};
choice = {};
for (xyz = 0; xyz < value2["choices_qty"]; xyz++) {
choice["id"] = value2["choices"][xyz]["id"];
choice["description"] = $("#q" + key2 + "_a" + xyz).val();
choices[xyz] = choice;
console.log(JSON.stringify(choice));
console.log(JSON.stringify(choices));
}
console.log(JSON.stringify(choices));
}
});
}
});
global_json_data = _data;
}
但是当我每次使用变量初始化它时它会给我正确的输出。代码是这样的：
function updateThirdLayer() {
_data = global_json_data;
$.each(_data, function(key1, value1) {
if (key1 == 'questions') {
$.each(value1, function(key2, value2) {
if (value2["choices_qty"] > 1) {
choices = {};
for (xyz = 0; xyz < value2["choices_qty"]; xyz++) {
choice = {};
choice["id"] = value2["choices"][xyz]["id"];
choice["description"] = $("#q" + key2 + "_a" + xyz).val();
choices[xyz] = choice;
console.log(JSON.stringify(choice));
console.log(JSON.stringify(choices));
}
console.log(JSON.stringify(choices));
}
});
}
});
global_json_data = _data;
}
JSON STRUCTURE：
{
"blah":"blah",
"questions":
{
0:
{
"blah":"blah",
"choices":
{
0:
{
"id":"",
"description":"desc"
}
}
}
}
}
注意：我知道我构建数据的方式是一种糟糕的方式，但请不要理会它。我的问题是解释为什么它的工作原理
感谢很多人！
编辑：
当我使用上面第一个代码块时，所有选项的“描述”成为选择描述中最后一项的值，用于选择中每个描述键的所有数据
global_json_data：
{"title":"1","total_qty":"3","per_page":"2","questions":{
"0": {"description":"1","type_id":"1","choices_qty":1,"choices":null},
"1": {"description":"2","type_id":"1","choices_qty":1,"choices":null},
"2": {"description":"3","type_id":"2","choices_qty":"4","choices":{
"0":{"id":"","description":""},
"1":{"id":"","description":""},
"2":{"id":"","description":""},
"3":{"id":"","description":""}
}
}
}}