HEGII.ft.mes.dashboard/wwwroot/main/Common/setting.js

function setScale(scale) {
    $('body').css({
        'zoom': scale,
        '-moz-transform': 'scale(' + scale + ')',
        '-moz-transform-origin': '0 0'
    });
}

$(document).ready(function () {
    if (request('scale') == '') {
        $.get('../common/api/setting.ashx?r=' + Math.random(), function (data) {
            var json = JSON.parse(data);
            scale = json["scale"];
            setScale(scale);
        });
    }
    else {
        setScale(request('scale'));
    }
});