javascript - Looping through numbered html tag id's -

i'm having issue not able loop through id's of multiple canvas tags have created edit various pixel data. canvases have id's ranging 0 - n. when id's created, numbers turned strings.

so, if create loop iterates through numbers correspond id's of tags, how make .getelementbyid(); method recognize number value string value? (this might little unclear code should clear things up)

for (var = 0; < 3; i++) { var usegetimagedata = function(i){      var canvas=document.getelementbyid(i);     var context=canvas.getcontext("2d");     var imagedata = context.getimagedata(0,0,canvas.width,canvas.height);     var data = imagedata.data;    } } 

the canvas id's are; "0", "1", "2"

try this. weren't calling function (which bad create inside loop anyhow).

var usegetimagedata = function(i){      var canvas=document.getelementbyid(i);     var context=canvas.getcontext("2d");     var imagedata = context.getimagedata(0,0,canvas.width,canvas.height);     var data = imagedata.data; } (var = 0; < 3; i++) {     // usegetimagedata(''+i);     // @andrew points out, gets interpreted string.     usergetimagedata(i); }