JavaScript 删除数组重复元素

unique :function (array){
          var n = {}, r = [], len = array.length, val, type;
            for (var i = 0; i < array.length; i++) {
                val = array[i];
                type = typeof val;
                if (!n[val]) {
                    n[val] = [type];
                    r.push(val);
                } else if (n[val].indexOf(type) < 0) {
                    n[val].push(type);
                    r.push(val);
                }
            }
            return r;
        },

        };

ES6 数组去重：

function dedupe(array) {
  return Array.from(new Set(array));
}

dedupe([1, 1, 2, 3]) // [1, 2, 3]

参考资料：

Fast Algorithm To Find Unique Items in JavaScript Array