微信小程序 实现图片自适应

< image src= "/images/1.jpg" bindload= "imageLoad"

style= "width:{{imgwidth}}rpx; height:{{imgheight }}rpx;"> image >

imageLoad: function (e) {

var _this = this;

var $width = e.detail.width, //获取图片真实宽度

$height = e.detail.height,

ratio = $width / $height; //图片的真实宽高比例

var viewWidth = 800, //设置图片显示宽度，

viewHeight = 800 / ratio; //计算的高度值

this.setData({

imgwidth: viewWidth,

imgheight: viewHeight

})

}