如何使用jQuery获取数组项的最后一个索引？

Question

我使用下面Array，

var s_a = new Array(); 
 
s_a[0]=""; 
 
s_a[1]="Badakhshan|Badghis|Baghlan|Balkh|Bamian|Farah|Faryab|Ghazni|Ghowr|Helmand|Herat|Jowzjan|Kabol|Kandahar|Kapisa|Konar|Kondoz|Laghman|Lowgar|Nangarhar|Nimruz|Oruzgan|Paktia|Paktika|Parvan|Samangan|Sar-e Pol|Takhar|Vardak|Zabol"; 
 
s_a[2]="Berat|Bulqize|Delvine|Devoll (Bilisht)|Diber (Peshkopi)|Durres|Elbasan|Fier|Gjirokaster|Gramsh|Has (Krume)|Kavaje|Kolonje (Erseke)|Korce|Kruje|Kucove|Kukes|Kurbin|Lezhe|Librazhd|Lushnje|Malesi e Madhe (Koplik)|Mallakaster (Ballsh)|Mat (Burrel)|Mirdite (Rreshen)|Peqin|Permet|Pogradec|Puke|Sarande|Shkoder|Skrapar (Corovode)|Tepelene|Tirane (Tirana)|Tirane (Tirana)|Tropoje (Bajram Curri)|Vlore"; 
 
s_a[3]="Adrar|Ain Defla|Ain Temouchent|Alger|Annaba|Batna|Bechar|Bejaia|Biskra|Blida|Bordj Bou Arreridj|Bouira|Boumerdes|Chlef|Constantine|Djelfa|El Bayadh|El Oued|El Tarf|Ghardaia|Guelma|Illizi|Jijel|Khenchela|Laghouat|M'Sila|Mascara|Medea|Mila|Mostaganem|Naama|Oran|Ouargla|Oum el Bouaghi|Relizane|Saida|Setif|Sidi Bel Abbes|Skikda|Souk Ahras|Tamanghasset|Tebessa|Tiaret|Tindouf|Tipaza|Tissemsilt|Tizi Ouzou|Tlemcen"; 
 
s_a[4]="Eastern|Manu'a|Rose Island|Swains Island|Western"; 
 
s_a[5]="Andorra la Vella|Bengo|Benguela|Bie|Cabinda|Canillo|Cuando Cubango|Cuanza Norte|Cuanza Sul|Cunene|Encamp|Escaldes-Engordany|Huambo|Huila|La Massana|Luanda|Lunda Norte|Lunda Sul|Malanje|Moxico|Namibe|Ordino|Sant Julia de Loria|Uige|Zaire"; 
 
s_a[6]="Anguilla"; 
 
s_a[7]="Antartica"; 
 
. 
 
. 
 
. 
 

 
s_a[105]="Andhra Pradesh|Arunachal Pradesh|Assam|Bihar|Goa|Gujarat|Haryana|Himachal Pradesh|Jammu and Kashmir|Karnataka|Kerala|Madhya Pradesh|Maharashtra|Manipur|Meghalaya|Mizoram|Nagaland|Orissa|Punjab|Rajasthan|Sikkim|Tamil Nadu|Tripura|Uttar Pradesh|West Bengal|Chhattisgarh|Uttarakhand|Jharkhand|Telangana ";

现在，我需要获得一个项目的索引中的最后一排（S_A [105]） 例子： 我的价值105在一个变量。然后我需要索引阿萨姆2。 请帮我...

Answer 1

需要split和indexOf方法结合起来像

index = s_a[variable].split("|").indexOf("Assam"); 

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请还会注意到它是香草JS它不依赖于jQuery的

Answer 2

var vari = s_a[s_a.length-1]; 
var index = vari.split('|').indexOf('Assam');