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微信小程序开发之图片等比例缩放获取屏幕尺寸图片尺寸自适应

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早上在论坛上看到有人写了关于图片等比例缩放的文章,只是判断了图片宽是否大于屏幕宽.我之前在做Android的时候也会遇到图片等比例缩放的问题.应该是用图片宽高比和屏幕宽高比做判断.做个笔记.老规矩,先上图.1.图片高宽比小于屏幕高宽比2.图片高宽比大于屏幕高宽比3.这种其实也是图片高宽比小于屏幕高宽比,但是高宽都大于屏幕高宽.所以不能简单用高宽来判断,应该是用高宽比判断后做缩放.上代码:1.index.wxml!–index.wxml–!–图片宽大于屏幕宽–image style=”width: {{imagewidth}}px; height: {{imageheight}}px;”  src=”{{imagefirstsrc}}” bindload=”imageLoad”/image!–图片高大于屏幕高–!–image style=”width: {{imagewidth}}px; height: {{imageheight}}px;”  src=”{{imagesecondsrc}}” bindload=”imageLoad”/image–!–图片宽高大于屏幕宽高–!–image style=”width: {{imagewidth}}px; height: {{imageheight}}px;”  src=”{{imagethirdsrc}}” bindload=”imageLoad”/image–2.index.js//index.js//获取应用实例var imageUtil = require(‘../../utils/util.js’);var app = getApp()Page({  data: {    imagefirstsrc: ‘http://bpic.588ku.com/back_pic/00/03/85/1656205138bbe2d.png’,//图片链接    imagesecondsrc: ‘http://bpic.588ku.com/back_pic/04/07/63/28581203949ca9d.jpg!/fw/400/quality/90/unsharp/true/compress/true’,//图片链接    imagethirdsrc:’http://img1.gtimg.com/ent/pics/hv1/13/71/2061/134034643.jpg’,    imagewidth: 0,//缩放后的宽    imageheight: 0,//缩放后的高  },  onLoad: function () {  },  imageLoad: function (e) {    var imageSize = imageUtil.imageUtil(e)    this.setData({      imagewidth: imageSize.imageWidth,      imageheight: imageSize.imageHeight    })  }})3.util.js//util.jsfunction imageUtil(e) {  var imageSize = {};  var originalWidth = e.detail.width;//图片原始宽  var originalHeight = e.detail.height;//图片原始高  var originalScale = originalHeight/originalWidth;//图片高宽比  console.log(‘originalWidth: ‘ + originalWidth)  console.log(‘originalHeight: ‘ + originalHeight)  //获取屏幕宽高  wx.getSystemInfo({    success: function (res) {      var windowWidth = res.windowWidth;      var windowHeight = res.windowHeight;      var windowscale = windowHeight/windowWidth;//屏幕高宽比      console.log(‘windowWidth: ‘ + windowWidth)      console.log(‘windowHeight: ‘ + windowHeight)      if(originalScale windowscale){//图片高宽比小于屏幕高宽比        //图片缩放后的宽为屏幕宽         imageSize.imageWidth = windowWidth;         imageSize.imageHeight = (windowWidth * originalHeight) / originalWidth;      }else{//图片高宽比大于屏幕高宽比        //图片缩放后的高为屏幕高         imageSize.imageHeight = windowHeight;         imageSize.imageWidth = (windowHeight * originalWidth) / originalHeight;      }         }  })  console.log(‘缩放后的宽: ‘ + imageSize.imageWidth)  console.log(‘缩放后的高: ‘ + imageSize.imageHeight)  return imageSize;}module.exports = {  imageUtil: imageUtil}我的博客:http://blog.csdn.net/qq_31383345

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