iframe嵌套的网页大小适应iframe

body {				//嵌套网页的body
    transform-origin:top left;
    overflow:hidden;
}

var w = Math.floor($(window).width() / 1767 * 100) / 100;
var h = Math.floor($(window).height() / 860 * 100) / 100;
var s = 0;
function scale() {
    if (w > h) {
        s = h;
    } else {
        s = w;
    }
    $('body').css({'transform': 'scale(' + s + ')','margin-left':($(window).width()-1767*s)/2,'margin-top':($(window).height()-860*s)/2});
}
scale();
$(document).on("mousewheel DOMMouseScroll", function (e) {
    var delta = (e.originalEvent.wheelDelta && (e.originalEvent.wheelDelta > 0 ? 1 : -1)) ||  // chrome & ie
        (e.originalEvent.detail && (e.originalEvent.detail > 0 ? -1 : 1));              // firefox
    if (delta > 0) {//向上滚动放大
        $('body').css({'transform': 'scale(1)', 'overflow': 'auto','margin':'0'});
    } else if (delta < 0) {// 向下滚动缩小
        $('html,body').animate({'scrollTop':0,'scrollLeft':0},10);
        $('body').css({'transform': 'scale(' + s + ')', 'overflow': 'hidden','margin-left':($(window).width()-1767*s)/2,'margin-top':($(window).height()-860*s)/2});
    }
});