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$(function(){
　$(window).scroll(function (){
    $('.effect-fade').each(function(){
        var elemPos = $(this).offset().top;
        var scroll = $(window).scrollTop();
        var windowHeight = $(window).height();
        if (scroll > elemPos - windowHeight+200){ //+200の部分でスクロールの高さを調整
            $(this).addClass('effect-scroll');
        }
    });
　});
});