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;
},

};

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

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