Home Web Front-end JS Tutorial How wx.getImageInfo() obtains image information

How wx.getImageInfo() obtains image information

May 23, 2018 am 11:23 AM
information picture

This article mainly introduces in detail how the WeChat applet wx.getImageInfo() obtains image information. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

1. Knowledge points

2. Lies

( 1).When loading


<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>
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var app = getApp()  
Page({ 
  data: {  
    tempFilePaths: &#39;../uploads/foods.jpg&#39;, 
    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, 
        }) 
      } 
    })  
  }  
})
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(2).When uploading pictures


<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>
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.zn-uploadimg{ 
  padding:1rem; 
} 
.zn-uploadimg image{ 
  margin:1rem 0; 
}
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var app = getApp()  
Page({ 
  data: {  
    tempFilePaths: &#39;&#39;,  
    imgwidth:0, 
    imgheight:0, 
  }, 
  /**  
   * 上传图片 
   */ 
  chooseimage: function () {  
    var _this = this;  
    wx.chooseImage({  
      count: 1, // 默认9  
      sizeType: [&#39;original&#39;, &#39;compressed&#39;], // 可以指定是原图还是压缩图,默认二者都有  
      sourceType: [&#39;album&#39;, &#39;camera&#39;], // 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, 
            }) 
          } 
        })  
      }  
    })  
  }  
})
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