failcanvasisempty

微信公开课小程序热门讨论关于「failcanvasisempty」的小程序开发问题
补充:当前Bug的表现（可附上截图）选择图片后显示canvasToTempFilePath:failcanvasisempty预期表现返回success信息复现路径提供一个最简复现DemowxchooseImage({201932压缩上传count:1,sizeTyp
展开:当前Bug的表现选择图片后显示canvasToTempFilePath:failcanvasisempty预期表现返回success信息复现路径提供一个最简复现DemowxchooseImage({201932压缩上传count:1,sizeType:[original,compressed],success:function(res){var_that=this;varpath=restempFilePaths[0];thatdatascardimg=restempFilePaths;consolelog(theoldpath:)consolelog(restempFilePaths[0])返回选定照片的本地文件路径列表，获取照片信息wxgetImageInfo({src:restempFilePaths[0],success:function(res){利用canvas压缩图片consolelog(getinfo)consolelog(res)varratio=2;varcanvasWidth=reswidth图片原始长宽varcanvasHeight=resheightwhile(canvasWidth400||canvasHeight400){保证宽高在400以内canvasWidth=Mathtrunc(reswidthratio)canvasHeight=Mathtrunc(resheightratio)ratio++;}thatsetData({cWidth:canvasWidth,cHeight:canvasHeight})consolelog(canvasHeight)consolelog(canvasWidth)consolelog(respath)绘制图形并取出图片路径varctx=wxcreateCanvasContext(firstCanvas);ctxdrawImage(respath,0,0,canvasWidth,canvasHeight);ctxdraw();将生成好的图片保存到本地，需要延迟一会，绘制期间耗时wxshowToast({title:图片压缩中,icon:loading,duration:500});ctxdraw(false,setTimeout(function(){wxcanvasToTempFilePath({canvasId:firstCanvas,destWidth:canvasWidth,destHeight:canvasHeight,success:function(res){vartempFilePath=restempFilePath;consolelog(successcanvas);thatsetData({scardimg:restempFilePaths,img_arr:thatdatascardimgconcat(restempFilePaths),show_addimg:0});wxhideToast()},fail:function(res){consolelog(res);}})},500));}})info}success})}
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