var data = canvas.toDataURL();
console.log(data );
chrome,android.... result
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAlsA
IOS result
data:image/png;base64,iVBORw0KGAAAAAAABBBBBBBBAAAAAAAAABBBBBBBBBBBAAAAAAAAA...
Why are they different?