I was just thinking back to the good old days when I used to use VBScript (good old days?!?!? What am I thinking?), and I remember using two very useful开发者_开发技巧 methods with arrays, these were UBound and LBound. Now I don't think JavaScript has these and if I wanted to make my own I could extend the object however, I just tried doing this to return the upperbound item (or the last item of the array)
var myArray = ['1','2','3','4','5','6','seven', 8, 'nine','10'];
document.write(myArray.length + ' ' + myArray[myArray.length]);
the myArray.length
returns what it should however when I try and output the last item using myArray[myArray.length]
I get undefined
? Anyone know why this is?
Thanks
The last element of myArray
is at myArray.length - 1
, since arrays in Javascript are 0-indexed. So , myArray[myArray.length -1]
is what you're looking for.
The indexes start at 0. The last element is at myArray.length - 1
精彩评论