js to get the number of elements with the same name and get the value of any one of them (get the last element value)

Reprinted from: http://blog.csdn.net/superit401/article/details/72629519

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1. <input name="a" id="1" value="南海">  
2.  <input name="a" id="2" value="特朗普">  
3.  <input name="a" id="3" value="月光宝盒">  
4.  <input name="a" id="4" value="大话西游">  
5.   
6. $(function(){  
7.          // get the number of elements  
8.     alert($('input:[name="a"]').length);   //4  
9.         //Get the new way of writing the value of the first element  
10.        alert($('input:[name="a"]:first').val()); //南海  
11.         //Get the new way of getting the last element value  
12.        alert($( 'input:[name="a"]:last' ).val()); // Westward Journey     
13.         //Get the second element value writing  
14.       alert($( 'input:[name="a"]:eq(1)' ).val()); //Trump  
15. })