Well, when using the ejs template
Many times, it is necessary to verify the validity of variables, including the length of arrays, etc.
So here comes the question
Some variables I didn’t pass in with render
How can I check it out?
typeof(var) ! == ‘undefined’
They all report mistakes.
Cannot read property 'name' of undefined
Do you have any good ideas?
Now it is necessary to pass an empty past, but I don’t need this empty past. I have to pass a lot of parameters in render every time ~
if (typeof(var) == ‘undefined’)
This will not make a mistake. . This is what I use here.
Var not is defined, can also be detected, not wrong.