数组去重

1、js数组根据对象中的元素去重

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"))

运行结果：

2、简单数组去重

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))

结果：