/*

*  方法:Array.remove(dx) 通过遍历,重构数组

*  功能:删除数组元素.

*  参数:dx删除元素的下标.

*/

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

}