微信小程序wx.getImageInfo()获取图片信息

梦里梦外; 2021-09-12 07:30 604阅读 0赞

一.知识点

![20170525134338000][]

二.列子

(1).加载时

<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: '../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, }) } }) } })

![20170525135446624][]

(2).上传图片时

<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, }) } }) } }) } })

![20170525134230037][]

[20170525134338000]: /images/20210813/bc11e88f0c1b4c7bbf846d27dc030cec.png
[20170525135446624]: /images/20210813/46b5f98180af4a9980e2360f229cded8.png
[20170525134230037]: /images/20210813/9d9218dcc55c4a8e82eebe93d8b377f8.png