<div class="user_cover" v-bind:style="styleCover"></div>

styleCover: {
    backgroundImage: 'url(' + $DATA.user.cover + config.qnLarge + ')',
    filter: 'blur(0)',
    transform: 'translate3d(0px, 0px, 0px) scale3d(1, 1, 1)'
}

$(window).scroll(function() {
    var scroll_top = $(window).scrollTop();
    var cover = $('.user_cover');
    var cover_blur = (20 * scroll_top) / 300;
    var cover_scale = 1 + (scroll_top / 1000);
    _main.styleCover.filter = 'blur(' + cover_blur + 'px)';
    _main.styleCover.transform = 'translate3d(0px, 0px, 0px) scale3d(' + cover_scale + ', ' + cover_scale + ', 1)';
});