修改编译警告

pages/component/canvas/canvas-context.uvue

@@ -825,7 +825,7 @@
         		success: () => {
         			console.log(`${key}字体加载成功`)
         			context.save()
-        			const text = value["text"] as String
+        			const text = value["text"] as string
         			context.font = `20px ${key}`
         			context.fillStyle = "red"
               yOffset += 25