js——动态加载json

//
    var num = 1;
//
window.onscroll = function () {
        var clientH = document.documentElement.clientHeight || document.body.clientHeight || 0;
        console.log(clientH);
        var top = contentFather.getBoundingClientRect().bottom;
        console.log(top);
        if (top - clientH < 10) {
            loadContent();
        }
    };
//
if (num < Object.keys(json).length) {
            //加载内容
            contentFather.innerHTML += content(json[num - 1]);
            num++;
        } else {
            num = Object.keys(json).length;
        }