swiper 里的图片大小如何设置 呢？ 为什么 给了高度以后就不按比例来显示呢？
参考答案一：用rpx做单位即可
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swiper {
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height: 300rpx;
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}
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swiper-item image {
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width: 100%;
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height: 100%;
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}
rpx（responsive pixel）: 可以根据屏幕宽度进行自适应。规定屏幕宽为750rpx。如在 iPhone6 上，屏幕宽度为375px，共有750个物理像素，则750rpx = 375px = 750物理像素，1rpx = 0.5px = 1物理像素。
参考答案二：图片等比例缩放，获取屏幕尺寸图片尺寸 自适应
直接上代码吧。
index.wxml
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<!--index.wxml-->
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<!--图片宽大于屏幕宽-->
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<image style="width: {{imagewidth}}px; height: {{imageheight}}px;" src="{{imagefirstsrc}}" bindload="imageLoad"></image>
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<!--图片高大于屏幕高-->
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<!--<image style="width: {{imagewidth}}px; height: {{imageheight}}px;" src="{{imagesecondsrc}}" bindload="imageLoad"></image>-->
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<!--图片宽高大于屏幕宽高-->
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<!--<image style="width: {{imagewidth}}px; height: {{imageheight}}px;" src="{{imagethirdsrc}}" bindload="imageLoad"></image>-->
index.js
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//index.js
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//获取应用实例
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var imageUtil = require('../../utils/util.js');
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var app = getApp()
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Page({
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data: {
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imagefirstsrc: 'http://bpic.588ku.com/back_pic/00/03/85/1656205138bbe2d.png',//图片链接
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imagesecondsrc: 'http://bpic.588ku.com/back_pic/04/07/63/28581203949ca9d.jpg!/fw/400/quality/90/unsharp/true/compress/true',//图片链接
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imagethirdsrc:'http://img1.gtimg.com/ent/pics/hv1/13/71/2061/134034643.jpg',
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imagewidth: 0,//缩放后的宽
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imageheight: 0,//缩放后的高
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},
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onLoad: function () {
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},
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imageLoad: function (e) {
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var imageSize = imageUtil.imageUtil(e)
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this.setData({
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imagewidth: imageSize.imageWidth,
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imageheight: imageSize.imageHeight
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})
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}
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})
util.js
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//util.js
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function imageUtil(e) {
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var imageSize = {};
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var originalWidth = e.detail.width;//图片原始宽
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var originalHeight = e.detail.height;//图片原始高
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var originalScale = originalHeight/originalWidth;//图片高宽比
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console.log('originalWidth: ' + originalWidth)
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console.log('originalHeight: ' + originalHeight)
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//获取屏幕宽高
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wx.getSystemInfo({
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success: function (res) {
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var windowWidth = res.windowWidth;
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var windowHeight = res.windowHeight;
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var windowscale = windowHeight/windowWidth;//屏幕高宽比
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console.log('windowWidth: ' + windowWidth)
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console.log('windowHeight: ' + windowHeight)
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if(originalScale < windowscale){//图片高宽比小于屏幕高宽比
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//图片缩放后的宽为屏幕宽
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imageSize.imageWidth = windowWidth;
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imageSize.imageHeight = (windowWidth * originalHeight) / originalWidth;
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}else{//图片高宽比大于屏幕高宽比
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//图片缩放后的高为屏幕高
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imageSize.imageHeight = windowHeight;
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imageSize.imageWidth = (windowHeight * originalWidth) / originalHeight;
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}
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}
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})
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console.log('缩放后的宽: ' + imageSize.imageWidth)
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console.log('缩放后的高: ' + imageSize.imageHeight)
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return imageSize;
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}
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module.exports = {
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imageUtil: imageUtil
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}
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