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var nk = [1,2,3]
axios.get(urlStr,{
params:{
hk:nk
}
})
let arr = [1, 2, 3];
let result = '?'+arr.map((item, index) => `item${index}=${item}`).join('&');
console.log(result); //output is '?item1=1&item2=2&item3=3'
qs.stringify({ a: ['b', 'c'] }, { arrayFormat: 'repeat' })

var nk = [1,2,3]
urlStr+=?
nk.forEach(e=>{
urlStr+="hk="+e+"&"
})
urlStr=urlStr.replace(/&$/,"")
axios.get(urlStr)