数组去重的

function filterJson(data, Name) {   //data是json对象，Name是根据什么字段去重
    var map = {},
      dest = [];
    for (var i = 0; i < data.length; i++) {
        var ai = data[i];
        if (i == 0) {
            dest.push(ai);
        } else {
            var filterData = dest.filter(function (e) {
                return e[Name] == ai[Name];
            })
            if (filterData.length == 0) {
                dest.push(ai);
            }
        }
    }
    return dest;

let arr1 = [1,2,3,5,8,9]
let arr2= [1,3,5,7]

let res1 = arr2.filter((x)=>{
  return arr1.includes(x)
})

console.log(res1) //[1,3,5]

const data = arr.slice(0,3).map(item=>item.code).toString()