SOURCE

let targetLen = [4,6,6,4]

const BASE_URL = 'https://www.mxnzp.com/api/lottery/common/history?'
//目前提供七种彩种， ssq：双色球，qlc：七乐彩，fc3d：福彩3D，cjdlt：超级大乐透，qxc：七星彩，pl3：排列3，pl5：排列(5)
const CODE = 'pl5'
//获取近期多少期开奖结果，MAX=50
const SIZE = 20
const APP_ID = 'mditkgelskgstp6v' 
const APP_SECRET = 'MXFnOWFKc2NjdlRjamVHSGVaL1hlZz09' 
let url = BASE_URL+'code='+CODE+ '&size='+SIZE +'&app_id='+APP_ID+'&app_secret='+APP_SECRET

let baseData = [0,1,2,3,4,5,6,7,8,9]
let result = Array.from({length:4},()=>[])
let openCode =[]

fetch(url).then(function(response) {
   if(response.status === 200){
     return response.json();
   }else{
     return {}
   }
}).then(json=>{
    json.data.forEach(item=>{
        openCode.push(item.openCode.split(',').splice(0,4))
    })
    //第一种规律，前十期相加取余数为目标code
    let targetCodes = Array.from({length:4},()=>0)
    let nowIndex = 0
    let nowCode = (9+nowIndex)%10
    openCode.forEach((code,index) =>{
        if(index>nowIndex-1)
            code.forEach((item,idx)=>{
                targetCodes[idx] += Number(item) 
            })
        if(index>nowIndex && index%10===nowCode){
            targetCodes.forEach((targetItem,targetIdx)=>{
                if(result[targetIdx].indexOf(targetItem%10)==-1)
                    result[targetIdx].push(targetItem%10) 
            })
        }
    })

    //第二种规律走单双，单下标+1双下标+2
    let targetIndex = Array.from({length:4},()=>0)
    openCode.forEach((code,index) =>{
     if(index>nowIndex-1)
        code.forEach((item,idx)=>{
            if(item%2==0){
                targetIndex[idx]+=2
            }else{
                targetIndex[idx]+=1
            }
        })
        if(index>nowIndex && index%10==nowCode){
            targetIndex.forEach((targetItem,targetIdx)=>{
                if(result[targetIdx].indexOf(targetItem%10)==-1)
                    result[targetIdx].push(targetItem%10) 
            })
        }
    }) 

     
    let target= result.map(i=>{
    return i.length==0?'X': i.sort().join('')
    }).join('-')
    console.log('Code',target)
})


// for(let i=0;i<4;i++){
//     for(let j=0;j<targetLen[i];j++){
//         let idx = 0
//         do{
//             idx = Math.floor(Math.random()*10)
//         }while(result[i].indexOf(baseData[idx])!==-1)
//         result[i].push(baseData[idx])
//     }
// }