如何在循环内设置变量而不弄乱循环？

Question

I'm quite new to this, so sorry if this is a daft question. I have searched for the answer but I can't find a close enough solution to adapt. This is part of my code:

for (var k = 0; k < (pointstoshow.length-1); k++){
   // k looping nicely at this point
u = pointstoshow[k]
   //k not looping at this point, only uses the last number
allpoints[u].setMap(map);
}

I am trying to access the numbers inside an array (pointstoshow) to use the number stored as a reference to search another array (allpoints), but I can't get it to work. If I set an alert to show pointstoshow[k] it works fine, it's only once I try and attach them to a variable it doesn't work.

I've been working on this most of today with no joy, so any suggestions appreciated.

Thanks

Answer 1

You missed a semi-colon and you need to declare u. Not entirely sure what needs to happen here so this is a shot in the dark.

var u;
for(var k = 0; k < (pointstoshow.length-1); k++){  
    u = pointstoshow[k];  
    allpoints[u].setMap(map);  
}