//查找数组中的val 的下标 Array.prototype.indexOf = function(val) { for (var i = 0; i < this.length; i++) { if (this[i] == val) return i; } return -1; } //找对数值对应下标,删除 Array.prototype.remove = function(val) { var�����綷,����� index = this.indexOf(val); if (index > -1) { this.splice(index, 1); } };//调用['4','5','6'].remove('5');//['4','6']