vue触底操作

 window.onscroll = function() {
            //变量scrollTop是滚动条滚动时，距离顶部的距离
            var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; //变量windowHeight是可视区的高度
            var windowHeight = document.documentElement.clientHeight || document.body.clientHeight; //变量scrollHeight是滚动条的总高度
            var scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight; //滚动条到底部的条件
            if (scrollTop + windowHeight == scrollHeight) {
                console.log("距顶部" +scrollTop +"可视区高度" + windowHeight +"滚动条总高度" +scrollHeight);

            }
        };