scale.fix.js

var metas = document.getElementsByTagName(‘meta‘);
var i;
if (navigator.userAgent.match(/iPhone/i)) {
    for (i=0; i<metas.length; i++) {
        if (metas[i].name == "viewport") {
            metas[i].content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
        }
    }
    document.addEventListener("gesturestart", gestureStart, false);
}
function gestureStart() {
    for (i=0; i<metas.length; i++) {
        if (metas[i].name == "viewport") {
            metas[i].content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6";
        }
    }
}