js creates jsonArray and transmits it to the background and comprehensive analysis in the background_Basic knowledge

I never figured out the difference between jsonArray and jsonObject before, but I finally figured it out today.

jsonArray is an array, containing data with [ ], and jsonObject is an object, containing data with { }.

Introducing an easy way to build a jsonArray in the frontend

 var array=[];

 for(int i=0;i<10;i++){

  var item={};

  item.a="a"+i;

  item.b="b"+i;

  array.push(item);

 }

 Ajax:

 params:{

 data:JSON.stringify(array),

 type:1

 }

Can receive in the background:

  String data=request.getParameter("array");

  JSONArray myArray=JSONArray.fromObject(data);

  for(int i=0;i<myArray.size();i++){

   JSONObject object=myArray.getJSONObject(i);

   String a = object.getString('a');

   String b = object.getString('b');

  }

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