Array.prototype.remove = function(index){
if(isNaN(index) || index > this.length){return false;}
for(var i = 0, n = 0; i < this.length; i++){
if(this[i] != this[index]){
this[n++] = this[i];
}
}
this.length -= 1;
}
//在数组中获取指定值的元素索引
Array.prototype.getIndexByValue = function(value){
var index = -1;
for(var i = 0; i < this.length; i++){
if(this[i] == value){
index = i;
break;
}
}
return index;
}
//使用举例
arr = ["1","2","3","4","5"];
var index = arr.getIndexByValue("2");
arr.remove(index);