1. 在html中动态加载图片（表示笔者并没有尝试过，记在这里可以试试）

通常使用new Image()创建一个图片对象，然后通过动态加载url指向图片，并获取图片信息。

2. 在小程序中可以使用image来实现 ,image有一个属性叫bindload（当图片载入完毕时，发布到 AppService 的事件名，事件对象event.detail = {height:'图片高度px', width:'图片宽度px'}）。简单来说就是用它来获取图片的高和宽。

3.简述一下思路：要做一个固定为2列的布局，图片数据将根据图片的高度，决定动态的添加到左列还是右列。

来实现一下：首先来做一个两列的布局

scroll-view scroll-y="true" style="height:{{scrollH}}px" bindscrolltolower="loadImages"  view style="width:100%"    view class="img_item"      view wx:for="{{col1}}" wx:key="id"        image src="{{item.pic}}" style="width:100%;height:{{item.height}}px"/image      /view    /view    view class="img_item"      view wx:for="{{col2}}" wx:key="id"        image src="{{item.pic}}" style="width:100%;height:{{item.height}}px"/image      /view    /view  /view/scroll-view

然后要在页面上放一个隐藏的区域，用它来获取图片的高度

view style="display:none"  image wx:for="{{images}}" wx:key="id" id="{{item.id}}" src="{{item.pic}}" bindload="onImageLoad"/image/view

是不是要监听滚动到底部？哈哈，非常完美scroll-view有一个属性叫做bindscrolltolower，当滚动到最右端或最低端就会触发这个事件。ok贴代码（loadImages方法到最底部重新加载一组图片）

loadImages: function () {        let images = [            { pic: "../../images/1.png", height: 0 },            { pic: "../../images/2.png", height: 0 },            { pic: "../../images/3.png", height: 0 },            { pic: "../../images/4.png", height: 0 },            { pic: "../../images/5.png", height: 0 },            { pic: "../../images/6.png", height: 0 },            { pic: "../../images/7.png", height: 0 },            { pic: "../../images/8.png", height: 0 },            { pic: "../../images/9.png", height: 0 },            { pic: "../../images/10.png", height: 0 },            { pic: "../../images/11.png", height: 0 },            { pic: "../../images/12.png", height: 0 },            { pic: "../../images/13.png", height: 0 },            { pic: "../../images/14.png", height: 0 }        ];        let baseId = "img-" + (+new Date());        for (let i = 0; i  images.length; i++) {            images[i].id = baseId + "-" + i;        }        this.setData({            loadingCount: images.length,            images: images        });        console.log(this.data.images)    }

加载到的图片分别放在左右列里面

 onImageLoad: function (e) {        let imageId = e.currentTarget.id;        let oImgW = e.detail.width;         //图片原始宽度        let oImgH = e.detail.height;        //图片原始高度        let imgWidth = this.data.imgWidth;  //图片设置的宽度        let scale = imgWidth / oImgW;        //比例计算        let imgHeight = oImgH * scale;      //自适应高度        let images = this.data.images;        let imageObj = null;        for (let i = 0; i  images.length; i++) {            let img = images[i];            if (img.id === imageId) {                imageObj = img;                break;            }        }        imageObj.height = imgHeight;        let loadingCount = this.data.loadingCount - 1;        let col1 = this.data.col1;        let col2 = this.data.col2;        if (col1H = col2H) {            col1H += imgHeight;            col1.push(imageObj);        } else {            col2H += imgHeight;            col2.push(imageObj);        }        let data = {            loadingCount: loadingCount,            col1: col1,            col2: col2        };        if (!loadingCount) {            data.images = [];        }        this.setData(data);    },