数组去重问题！！

数组去重问题！！

只写两种方法哈

1.function fun(arr){

  return arr.filter((elem,index,arr)=>{

  return arr.indexOf(elem) === index
  
  })

}

let arr = [1,2,32,1,2,1,4,5,6,4,3,56,3,7]

let newarr = [...new Set(arr)]

console.log(newarr)