帮忙看下，wx.canvasToTempFilePath没有反应
发布于 6 年前 作者 kqiao 10534 次浏览 来自 问答
pyq:function(){
    var that =this
    wx.showLoading({
      title: '请稍后...',
    })
    wx.request({
      url: app.url +'addScan',
      daya:{
        page:"pages/detail/detail",
        one:that.data.detail.id,
        two:that.data.toptjm
      },
      success:function(res){
        console.log(res.data)
        wx.hideLoading()
        var context = wx.createCanvasContext('mycanvas', this)
        context.drawImage(res.data, 50, 20, 200, 200)
        context.setFillStyle('#676050')
        context.setFontSize(18)
        context.setTextAlign('center')
        context.fillText("优趣商城",150,260)
        context.setFontSize(14)
        context.fillText(that.data.detail.name, 150, 300)
        context.setFontSize(12)
        context.fillText("立即扫码选购", 150, 380)
        context.draw(true, wx.canvasToTempFilePath({
          canvasId: 'mycanvas',
          success: function (res) {
            console.log(res);
            // wx.saveImageToPhotosAlbum({
            //   filePath: res.tempFilePath,
            //   success(result) {
            //     console.log(result)
            //     wx.showToast({
            //       title: '图片保存成功',
            //       icon: 'success',
            //       duration: 2000
            //     })
            //   }
            // })
            that.setData({
              scans: 1
            })
          }
        }));
 
         
         
 
      }
    })
  },
2 回复

wx.canvasToTempFilePath最好也加个200的延时，绘制多内容在性能低的安卓机下，因为draw是个异步的,经常失败

ctx.draw(false, function() {

console.log(‘绘制完成’);

在这里再去调用

wx.canvasToTempFilePath

});

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