flutter_echarts1.2.0 在iphone6 plus上不显示，错误提示：chart.setOption is not a function #7
Description
Error Domain=WKErrorDomain Code=4 "A JavaScript exception occurred" UserInfo={WKJavaScriptExceptionLineNumber=1, WKJavaScriptExceptionMessage=TypeError: chart.setOption is not a function. (In 'chart.setOption', 'chart.setOption' is undefined), WKJavaScriptExceptionSourceURL=data:text/html;base64,ICAgIDwhRE9DVFlQRSBodG1sPgogICAgPGh0bWw+CiAgICAgIDxoZWFkPgogICAgICAgIDxtZXRhIGNoYXJzZXQ9InV0Zi04Ij ... PgogIA==, NSLocalizedDescription=A JavaScript exception occurred, WKJavaScriptExceptionColumnNumber=22})
0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321:33)
2 MethodChannelWebViewPlatform.evaluateJavascript (package:webview_flutter/src/webview_method_channel.dart:95:21)
3 WebViewController.evaluateJavascript (package:webview_flutter/webview_flutter.dart:655:39)
4 _EchartsState.init (package:flutter_echarts/flutter_echarts.dart:112:24)
5 _EchartsState.echartWidget. (package:flutter_echarts/flutter_echarts.dart:141:9)
6 _PlatformCallbacksHandler.onPageFinished (package:webview_flutter/webview_flutter.dart:481:15)
7 MethodChannelWebViewPlatform._onMethodCall (package:webview_flutter/src/webview_method_channel.dart:41:35)
8 MethodChannel._handleAsMethodCall (package:flutter/src/services/platform_channel.dart:402:55)
9 MethodChannel.setMethodCallHandler. (package:flutter/src/services/platform_channel.dart:370:54)
10 _DefaultBinaryMessenger.handlePlatformMessage (package:flutter/src/services/binding.dart:200:33)
11 _invoke3. (dart:ui/hooks.dart:303:15)
12 _rootRun (dart:async/zone.dart:1126:13)
13 _CustomZone.run (dart:async/zone.dart:1023:19)
14 _CustomZone.runGuarded (dart:async/zone.dart:925:7)
15 _invoke3 (dart:ui/hooks.dart:302:10)
16 _dispatchPlatformMessage (dart:ui/hooks.dart:162:5)