鼠标滚轮放大图片 -JS

//以鼠标位置为中心的图片滚动放大缩小

//以鼠标位置为中心的图片滚动放大缩小
$(document).on("mousewheel",".layui-layer-photos",function(ev){
    var oImg = this;
    var ev = event || window.event;//返回WheelEvent
    //ev.preventDefault();
    var delta = ev.detail ? ev.detail > 0 : ev.wheelDelta < 0;
    var ratioL = (ev.clientX - oImg.offsetLeft) / oImg.offsetWidth,
        ratioT = (ev.clientY - oImg.offsetTop) / oImg.offsetHeight,
        ratioDelta = !delta ? 1 + 0.1 : 1 - 0.1,
        w = parseInt(oImg.offsetWidth * ratioDelta),
        h = parseInt(oImg.offsetHeight * ratioDelta),
        l = Math.round(ev.clientX - (w * ratioL)),
        t = Math.round(ev.clientY - (h * ratioT));
    $(".layui-layer-photos").css({
        width: w, height: h
        ,left: l, top: t
    });
    $("#layui-layer-photos").css({width: w, height: h});
    $("#layui-layer-photos>img").css({width: w, height: h});
});

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