微信小程序wx.getImageInfo()获取图片信息

<view class="zn-uploadimg">
<image src="{{tempFilePaths}}" mode="aspecFill" style="width: 100%; height: 450rpx" />
<text>图片的大小：{{imgwidth}}px*{{imgheight}}px</text>
</view>

var app = getApp()
Page({
data: {
tempFilePaths:
4000
'../uploads/foods.jpg',
imgwidth:0,
imgheight:0,
},
onReady:function(){
// 页面渲染完成
var _this = this;
wx.getImageInfo({
src: _this.data.tempFilePaths,
success: function (res) {
_this.setData({
imgwidth:res.width,
imgheight:res.height,
})
}
})
}
})

<view  class="zn-uploadimg">
<button type="primary"bindtap="chooseimage">获取图片</button>
<image src="{{tempFilePaths}}" mode="aspecFill" style="width: 100%; height: 450rpx"/>
<text>图片的大小：{{imgwidth}}px*{{imgheight}}px</text>
</view>

.zn-uploadimg{
padding:1rem;
}
.zn-uploadimg image{
margin:1rem 0;
}

var app = getApp()
Page({
data: {
tempFilePaths: '',
imgwidth:0,
imgheight:0,
},
/**
* 上传图片
*/
chooseimage: function () {
var _this = this;
wx.chooseImage({
count: 1, // 默认9
sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success: function (res) {
// 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
_this.setData({
tempFilePaths:res.tempFilePaths
})
wx.getImageInfo({
src: res.tempFilePaths[0],
success: function (res) {
_this.setData({
imgwidth:res.width,
imgheight:res.height,
})
}
})
}
})
}
})