'use strict';

const fetch = require('node-fetch');
            
            String.prototype.replaceAll = function (FindText, RepText) {
                var regExp = new RegExp(FindText, "g");
                return this.replace(regExp, RepText);
            }
            
            function gcd(a,b){//最大公因数 (Greatest common divisor)

if(b == 0){
                    return a;
                }
                var r = a % b;
                console.log(r);
                return gcd(b,r);
                
                
            }
var glb_json ='';

if (type=="") type="none";
                var subs=glb_json["子集s"];
                if (subs[type]){
                    return subs[type];
                }
                return [];
                
}

function rnd_item_子集_select(type){
 var items=rnd_item_子集(type);
 var index=Math.floor(Math.random() * items.length);
 var action1=items[index];
 var action2='';
 if (index+1<items.length){
 action2=items[index+1];
 }else{
 var index2=(index+1) % items.length;
 action2=items[index2];
 }
 var action3='';
 if (index+2<items.length){
 action3=items[index+2];
 }else{
 var index2=(index+2) % items.length;
 action3=items[index2];
 }
 return [action1,action2,action3];
 }
 function item_property(main,property){
 
 var obj=glb_json["property"];
 return obj[main][property];
 
 }
exports.main = async (event, context) => {

//var question_id=event['id'];
               var question_id=event.queryStringParameters.id;
               var url = 'https://test1-8g19ckpr4c393d6a-1312663308.tcloudbaseapp.com/'+question_id+'.json';
              try {
                const response = await fetch(url)
                glb_json = await response.json();
            
                console.log(glb_json);
              } catch (error) {
                console.log(error.response.body);
              }
            var content=glb_json.content;
var answer=glb_json.answer;
var analysis=glb_json.analysis;
var draw=glb_json.draw;

var var_array=[];
 
 for(var j=0;j<glb_json['define'].length;j++){

var var1=glb_json['define'][j]['var'];
 var sfrom=glb_json['define'][j]['from'];
 var to=glb_json['define'][j]['to'];
 
 if (sfrom!=''){
 var_array[var1]=rnd(sfrom,to);
 }
 
 content=content.replaceAll('《'+var1+'》',var_array[var1]);
 answer=answer.replaceAll('《'+var1+'》',var_array[var1]);
 analysis=analysis.replaceAll('《'+var1+'》',var_array[var1]);
 }
 
 for(var i=0;i<glb_json["vars"].length;i++){

var var1 =glb_json["vars"][i]["var"];
 var line=glb_json["vars"][i]["line"];
 var_array[var1]=line;
 
 
 for(var j=0;j<glb_json["define"].length;j++){

var var2=glb_json['define'][j]['var'];
 
 if (var2!=''){
 var_array[var1]=var_array[var1].replaceAll(
 '《'+var2+'》',var_array[var2]);
 }
 
 
 }
 for(var j=0;j<i;j++){

var var2=glb_json["vars"][j]["var"];
 
 var_array[var1]=var_array[var1].replaceAll(
 '《'+var2+'》',var_array[var2]);
 }
 var_array[var1]=eval(var_array[var1]);
 
 }
 
 for(var i=0;i<glb_json["vars"].length;i++){

var var1=glb_json["vars"][i]["var"];
                //var line=glb_json["vars"][i]["line"];

content=content.replaceAll("《"+var1+"》",var_array[var1]);
                
                Description=Description.replaceAll("《"+var1+"》",var_array[var1]);
                
                answer=answer.replaceAll("《"+var1+"》",var_array[var1]);
                
                analysis=analysis.replaceAll("《"+var1+"》",var_array[var1]);
                
                draw=draw.replaceAll("《"+var1+"》",var_array[var1]);
                
                
            }
            
            var arr_var=new Map()

编辑

{"子集s":{
"none":["卖粮食","玩游戏","做五角星","种树","做灯笼","卖手机","踢毽子","折纸飞机","看书","吃葡萄","修路","做花","铺地毯","加工零件","抓蝴蝶"]
}
,
 "define": [
 {
 "var": "a",
 "from": "2",
 "to": "9",
 "memo": ""
 },
 {
 "var": "b",
 "from": "2",
 "to": "9",
 "memo": ""
 }
 ],
 "vars": [
 {
 "var": "a2",
 "line": "a*2",
 "memo": ""
 },
 {
 "var": "b2",
 "line": "b*2",
 "memo": ""
 },
 {
 "var": "m1",
 "line": "b*b*2-a*a*2",
 "memo": ""
 }
 ],
 "dbs": [],
 "strings": [],
 "code_break": "a*1.414<b*0.8",
 "code_define": "var a;\nvar b;\nvar a2;\nvar b2;\nvar m1;\n",
 "code_rnd": "a=rnd(2,9);\ndic.set(\"a\",a);\nb=rnd(2,9);\ndic.set(\"b\",b);\n",
 "code_var": "a2=a*2;\ndic.set(\"a2\",a2);\nb2=b*2;\ndic.set(\"b2\",b2);\nm1=b*b*2-a*a*2;\ndic.set(\"m1\",m1);\n"

,"content":"var dic= new Map();\n var _max = 1000;\r\nvar _a= 0;\r\n${code_define}\r\ndo {\r\n a=rnd(2,9);\ndic.set(\"a\",a);\nb=rnd(2,9);\ndic.set(\"b\",b);\n\r\n a2=a*2;\ndic.set(\"a2\",a2);\nb2=b*2;\ndic.set(\"b2\",b2);\nm1=b*b*2-a*a*2;\ndic.set(\"m1\",m1);\n\r\n if (a*1.414<b*0.8) {\r\n break;\r\n }\r\n _a ++;\r\n} while (_a< _max);\r\na2=a*2;\ndic.set(\"a2\",a2);\nb2=b*2;\ndic.set(\"b2\",b2);\nm1=b*b*2-a*a*2;\ndic.set(\"m1\",m1);\n\n \n var _t1=\"《题目》\";\n var _t2=\"《答案》\";\n var _t3=\"《分析》\";\n var _t4=\"《绘图》\";\n var sys_a1=replacePlaceholders(_t1,dic);\n var sys_a2=replacePlaceholders(_t2,dic);\n var sys_a3=replacePlaceholders(_t3,dic);\n var sys_a4=replacePlaceholders(_t4,dic);\n ",
 "description":"AB长度为《a》，CD长度为 《b》 ，角A角C为直角，角D为45度，求这个多边形面积。",
 "answer":"《m1》",
 "analysis":"延长CB和DA，交点是O \r\n \r\n则OCD是等腰三角形， \r\n面积是《b2》*《b2》\/2 \r\n \r\n则OAB是等腰三角形， \r\n面积是《a2》*《a2》\/2 \r\n \r\n《b2》*《b2》\/2-《a2》*《a2》\/2=《m1》 \r\n",
 "string_end":"",
 "draw":"点:A:《a》\/1.414,《a》\/1.414,\r\n点:B:0,《a》*1.414,\r\n点:C:0,《b》,\r\n点:D:《b》,《b》,\r\n线:l1:A,B,\r\n线:l2:C,B,\r\n线:l3:C,D,\r\n线:l4:A,D,\r\n",
 "version":7,
 "test":0,
 "tags":"几何,五年级上册,多边形,","property":
{"卖粮食":{"":""},"玩游戏":{"":""},"做五角星":{"":""},"种树":{"":""},"做灯笼":{"":""},"卖手机":{"":""},"踢毽子":{"":""},"折纸飞机":{"":""},"看书":{"":""},"吃葡萄":{"":""},"修路":{"":""},"做花":{"":""},"铺地毯":{"":""},"加工零件":{"":""},"抓蝴蝶":{"":""}},"fields":""
}