try-catch

try

{ ... }

catch(ex)

{ ... }

首先执行 try 语句块。若没有异常发生，跳过 catch 语句块，try 语句执行结束；否则如果在 try 语句块的执行过程中发生了一个异常，错误消息将会存放在变量 ex 中，然后再执行 catch 语句块。

1/`7
// output
Arguments for div method can not be string.

try {1/`7} catch(ex){print "oops, please make sure they are all numbers"};
// output
oops, please make sure they are all numbers

ex;
// output
"SYSTEM_Operator" : "Arguments for div method can not be string."