例如： var arr = [1, 2, 3, 1, 2]; var newArr= [...new Set(arr)]

function uniqueEasy(arr) {
    if(!arr instanceof Array) {
        throw Error('当前传入的不是数组')
    }
    let list = []
    let obj = {}
    arr.forEach(item => {
        if(!obj[item]) {
            list.push(item)
            obj[item] = true
        }
    })
    return list
}

var arr=['12','32','89','12','12','78','12','32'];


function u_arr(array) {
    var h = [];
    for (var i = 0;i<array.length; i++) {
        if(h.indexOf(array[i]) == -1) {
            h.push(array[i])
        }
    }
      return h;
}
 var sarr=u_arr(arr);

 console.log(sarr)

console.log(Array.from(new Set([2, 3, 3, 5, 6]))); //[2,3,5,6]