canvas.toDataURL('image/png') 导致APP崩溃

应该是内存不足导致崩溃，估计是以前的手机像素不够高吧。
这种webview内部api，不会随着HBuilderX升级而变化。但手机是可以升级webview的

所有人 所有ios 手机这个都不行

我的解决了，是图片太大的原因，我的图片都以800X800进行缩放就行了，然后图片转成jpeg类型的就好了

var image = new Image();
//image.setAttribute('crossOrigin', 'anonymous');
//image.crossOrigin="anonymous"; //关键
image.src = fileSrc;
plus.nativeUI.showWaiting('打水印中');

                image.onload = function() {  
                    //var canvasD = document.getElementById('photo8888');  
                    var canvasD = document.createElement('canvas');  
                    console.log("加载水印");  
                    console.log(this.width + '####' + this.height);  
                    var originWidth = this.width;  
                    var originHeight = this.height;  
                    // 最大尺寸限制，可通过国设置宽高来实现图片压缩程度  
                    var maxWidth = 800;  
                    var maxHeight = 800;  
                    // 目标尺寸  
                    var targetWidth = originWidth;  
                    var targetHeight = originHeight;  
                    // 图片尺寸超过400x400的限制  
                    if (originWidth > maxWidth || originHeight > maxHeight) {  
                        if (originWidth / originHeight > maxWidth / maxHeight) {  
                            // 更宽，按照宽度限定尺寸  
                            targetWidth = maxWidth;  
                            targetHeight = Math.round(maxWidth * (originHeight / originWidth));  
                        } else {  
                            targetHeight = maxHeight;  
                            targetWidth = Math.round(maxHeight * (originWidth / originHeight));  
                        }  
                    }  
                    console.log(targetWidth + '####' + targetHeight);  

                    canvasD.width = targetWidth;  
                    canvasD.height = targetHeight;  
                    var ctx = canvasD.getContext("2d");  
                    //ctx.clearRect(0, 0, targetWidth, targetHeight);  
                    ctx.drawImage(this, 0, 0, canvasD.width, canvasD.height);  
                    //绘制水印  
                    // ctx.font = "bolder 32px microsoft yahei";  
                    ctx.font = "bold 20px Arial"  
                    ctx.fillStyle = "rgba(254,61,55,1)";  
                    var lineHeight = 32;  
                    var chaCount = 10;  
                    var starHeight = 40;  
                    var totalHeight = targetHeight - 5;  

                    var hang = 0;  
                    var len = parseInt(targetWidth * 24 / 694) * 2;  
                    var canLen = len * 2;  
                    console.log('一行的文字数量:' + len);  

                    if (dataShuiyin.address) {  
                        if (dataShuiyin.address.length > len) {  
                            hang = 1;  
                        } else {  
                            hang = 0;  
                        }  

                        writeTextOnCanvas(ctx, lineHeight, canLen, dataShuiyin.address, 2, totalHeight - hang * lineHeight);  

                    }  
                    //ctx.fillText(dataShuiyin.address,2,totalHeight - hang * lineHeight)   ;             

                    //经纬度  
                    ctx.fillText(dataShuiyin.longlat, 2, totalHeight - (hang + 1) * lineHeight);  

                    //营业厅  
                    ctx.fillText(dataShuiyin.yingValue, 2, totalHeight - (hang + 2) * lineHeight);  

                    //终端编号  
                    ctx.fillText(dataShuiyin.temalValue, 2, totalHeight - (hang + 3) * lineHeight);  

                    //console.log('4**' + canvasD.toDataURL('image/jpeg', 0.92));  

                    cover.attr('src', canvasD.toDataURL('image/jpeg', 0.92));  

                }

代码贴出来，大家参考下