图片缩放

imageLoadNewGoods: function (event) {

var id = event.target.dataset.id

var viewWidth = this.data.phoneInfo.screenWidth

var viewHeight = 150;

ratio = viewWidth / viewHeight;

 

for (var i = 0; i < this.data.newGoods.length; i++) {

var item = this.data.bannerData[i];

if (item.id === id) {

var w = event.detail.width, //获取图片真实宽度

h = event.detail.height,

picRatio = w / h; //图片的真实宽高比例

if (picRatio >= ratio) {

item.width = viewWidth;

item.height = w / picRatio;

} else {

item.height = viewHeight;

item.width = item.height * picRatio;

}

 

}

this.data.newGoods[i] = item;

}

that.setData({

newGoods: that.data.newGoods

});

},