删除数组中冗余元素

var deleteDublicate = function(arr) {
    var temp = {};
    var newArry = [];
    arr.forEach(e => {
        if (!temp[e]) {
            newArry.push(e);
            temp[e] = true
        }
    });
    return newArry
}
var array = [1,2,3,3,4,5];
deleteDublicate(array);

当ES6出现后，删除冗余变得更加简单：

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

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