//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 index = this.indexOf(val);
if (index > -1) {
this.splice(index, 1);
}
};
//调用
['4','5','6'].remove('5');//['4','6']
