What does the below line do considering it as the first line in your javascript file (function(){alert(this)})();
A. Nothing happens
B. I will see an error
C. I will see an alert with undefined value
D. I will see an alert with null value
E. I will see an alert with not null value
How can we starts Javascript ?
A. script tag
B. javascript tag
C. language tag
D. None of above
How can we declare variable in javascript
A. datatype
B. var
C. iInt
D. float
微信支付 
支付宝支付