// 图片加载器 Promise
    function iloader(src){
        return new Promise(function(resolve, reject){
            const image = new Image();

            image.onload = function(){resolve(image);};
            image.onerror = function(err){reject(err);};

            image.src = src;
            if(image.complete){resolve(image);}
        });
    }

    document.addEventListener('DOMContentLoaded', function(){
        let io = new IntersectionObserver(entries => {
            entries.forEach(entry => {
                if(entry.intersectionRatio > 0){
                    let wrap = entry.target;
                    let src = wrap.dataset.src;
                    /*console.log(src);*/
                    iloader(src).then(function(){
                        wrap.outerHTML = `<img src='${src}' class='show'>`;
                    });
                    io.unobserve(wrap);
                }
            });
        });

        document.querySelectorAll('img.lazy[data-src]').forEach(function(img){
            let src = img.dataset.src;
            img.outerHTML = `<div class='lazyImg-wrap' data-src='${src}'><div class='lazyImg-loader'></div></div>`;
        });
        document.querySelectorAll('.lazyImg-wrap').forEach(function(wrap){
            io.observe(wrap);
        });
    });
    console.clear();