feat: 屏蔽canvas setShadow 方法，基础库修复后再放出来

pages/API/canvas/example.js

@@ -222,12 +222,12 @@ example.setGlobalAlpha = function (context) {
   })
 }
 
-example.setShadow = function (context) {
+// example.setShadow = function (context) {
-  context.beginPath()
+//   context.beginPath()
-  context.setShadow(10, 10, 10, 'rgba(0, 0, 0, 199)')
+//   context.setShadow(10, 10, 10, 'rgba(0, 0, 0, 199)')
-  context.rect(10, 10, 100, 100)
+//   context.rect(10, 10, 100, 100)
-  context.fill()
+//   context.fill()
-}
+// }
 
 example.setFontSize = function (context) {
   [10, 20, 30, 40].forEach(function (item, index) {