js 判断数组包含某值的方法 和 javascript数组扩展indexOf()方法

var  questionId = []; var anSwerIdValue = [];

////javascript数组扩展indexOf()方法

Array.prototype.indexOf = function (e) {
for (var i = 0, j; j = this[i]; i++) {
if (j.indexOf(e) != -1) {
　　return i;
　　}
}
　　return -1;
}

if (anSwerIdValue.length < 14) {
alert("请你答满13题目");
return false;
} else if (questionId.length == 13 && anSwerIdValue.indexOf(questionId[12] + '|') != -1) {

$("#pagingForm").attr("action", "@Url.Action("QuestionAtion", "QuestionSubmit")");
//form.submit();
document.getElementById("pagingForm").submit();
} else {
alert("请你答满13题目");
return false;
}

questionId :

-------------------------------------

$("input[name=questionId]").each(function () {

questionId.push($(this).val());
});

anSwerIdValue :

---------------------------------------------------
$("input[name=anSwerIdValue]:checked").each(function () {
var questionid = $(this).attr("data-questionid");
var qtype = $(this).attr("data-type");
if (qtype == 2) {
anSwerIdValue.push(questionid + "|" + $(this).val());
$(this).val(questionid + "|" + $(this).val());
var answerItemId = [];
answerItemId.push(questionid + "|" + $(this).val());
$("#answerItemId" + questionid).val(answerItemId);
} else {
anSwerIdValue.push($(this).val());
}

});

----------------------------------------------------------------

1.anSwerIdValue: Array[18]
0: "14|11"
1: "14|13"
2: "14|14"
3: "14|19"
4: "14|20"
5: "14|23"
6: "15|25"
7: "16|28"
8: "17|34"
9: "17|35"
10: "17|36"
11: "18|62"
12: "18|63"
13: "19|58"
14: "19|59"
15: "20|54"
16: "20|55"
17: "21|51"

----------------------------------------------------------------

1. questionId: Array[13]
1. 0: "14"
2. 1: "15"
3. 2: "16"
4. 3: "17"
5. 4: "18"
6. 5: "19"
7. 6: "20"
8. 7: "21"
9. 8: "22"
10. 9: "23"
11. 10: "24"
12. 11: "25"
13. 12: "26"
14. length: 13

---------------------------------------------------------

/////js 判断数组包含某值的方法

//// 判断数组中包含element元素

实例1：
  Array.prototype.contains = function (element) {
  
    for (var i = 0; i < this.length; i++) {
        if (this[i] == element) {
            return true;
        }
    }
    return false;
}

这样就可以直接调用此方法来判断。

var arr = new Array();

if(arr.constains("ddd")){

arr[i] = "dfsdfsd";

}

http://bbs.csdn.net/topics/360007998

---------------------------------------

实例2：javascript版本 Array.prototype.indexOf 与 Array.prototype.lastIndexOf 方法扩展

http://bbs.blueidea.com/thread-2853519-1-1.html

Array.prototype.indexOf = function(e){
  for(var i=0,j; j=this[i]; i++){
    if(j==e){return i;}
  }
  return -1;
}
Array.prototype.lastIndexOf = function(e){
  for(var i=this.length-1,j; j=this[i]; i--){
    if(j==e){return i;}
  }
  return -1;
}

然后lz可以这样：
var a =['red','blue','green','blue'];
alert(a.indexOf("blue"));
alert(a.lastIndexOf("blue"));