postMessage 方法
实现
void postMessage(/*any*/ message, [List<Object>? transfer]) {
if (transfer != null) {
var message_1 = convertDartToNative_SerializedScriptValue(message);
_postMessage_1(message_1, transfer);
return;
}
var message_1 = convertDartToNative_SerializedScriptValue(message);
_postMessage_2(message_1);
return;
}