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components/tpx-bluetooth-print/tpx-bluetooth-print.vue

@@ -30,20 +30,17 @@ export default {
 		}
 	},
 	mounted () {
+		this.initData()
 	},
 	unmounted() {
 	},
 	methods: {
+		async initData() {
+			this.pic_res = await this.renderPic();
+		},
 		// 打印-发送二进制数据
 		async writeBLECharacteristicValue(){
-			
-			let pic_res
-			try{
-				pic_res = await this.renderPic();
-				showToast('图片获取成功')
-			}catch(e){
-				showToast('图片获取失败')
-			}
+			let pic_res = this.pic_res
 			let printerJobs = new PrinterJobs()
 			
 			printerJobs
@@ -134,11 +131,12 @@ export default {
 					src: filePath,
 					success(res) {
 						cxt.drawImage(filePath, 0, 0, that.canvas_width, that.canvas_height);
-						cxt.draw();
-						that.$nextTick(async () => { //获取画布像素数据
-							let data = await that.getImageInfo({ canvasId: that.canvasId, width: that.canvas_width, height: that.canvas_height, })
-							resolve(data)
-						})
+						cxt.draw(true, ()=> {
+							setTimeout( async ()=> {
+								let data = await that.getImageInfo({ canvasId: that.canvasId, width: that.canvas_width, height: that.canvas_height, })
+								resolve(data)
+							}, 1000)
+						});
 					},
 					fail(e) {
 						reject(e)