微信小程序--图片等比例缩放 获取屏幕尺寸图片尺寸 自适应

//

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

('originalWidth: ' + originalWidth)

('originalHeight: ' + originalHeight)

//获取屏幕宽高

({

success: function (res) {

var windowWidth = ;

var windowHeight = ;

var windowscale = windowHeight/windowWidth;//屏幕高宽比

('windowWidth: ' + windowWidth)

('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

= windowWidth;

= (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

= windowHeight;

= (windowHeight * originalWidth) / originalHeight;

}

}

})

('缩放后的宽: ' + )

('缩放后的高: ' + )

return imageSize;

}

= {

imageUtil: imageUtil

}