js删除数组元素

Array.prototype.remove = function (dx) {
            if (isNaN(dx) || dx > this.length) { return false; }
            for (var i = 0, n = 0; i < this.length; i++) {
                if (this[i] != this[dx]) {
                    this[n++] = this[i]
                }
            }
            this.length -= 1
        }