//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

  })

 }

})

//util.js

function 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

}