JS实现数组简单去重及数组根据对象中的元素去重操作示例

var arr1 = [1, 2, 3, 4, 5, 6, 3, 4, 3];function arrayUnique1(arr) {  var result = [], hash = {};  for (var i = 0, elem; (elem = arr[i]) != null; i++) {    if (!hash[elem]) {      result.push(elem);      hash[elem] = true;    }  }  return result;}console.log(arrayUnique1(arr1));

var arr2 = [  { name: "name1", num: "1" },  { name: "name2", num: "11" },  { name: "name3", num: "12" },  { name: "name4", num: "13" },  { name: "name2", num: "1" },  { name: "name6", num: "12" }]function arrayUnique2(arr, name) {  var hash = {};  return arr.reduce(function (item, next) {    hash[next[name]] ? '' : hash[next[name]] = true && item.push(next);    return item;  }, []);}console.log(arrayUnique2(arr2, "name"));console.log(arrayUnique2(arr2, "num"));