length等基本函数，无效

console.log('sms coming' + smstext); while (smstext.length > 0) { var find = false; length方法提示方法不存在 具体报错如下： 1919 15:46:29.638 error VarExpr getDeclaredMethod:java.lang.NoSuchMethodException: com.libra.sar.robot.jsengine.var.object.b.getLength [] 1920 15:46:29.643 error VarExpr method is null:getLength cls:class com.libra.sar.robot.jsengine.var.object.b