无法在JavaScript中干燥简写if-else（条件三元运算符）

Question

i have a simple page of html has a button toggles a div,, however all is working fine but i have an if-else statement in my code like this:

 if (info.style.display === '' || info.style.display == 'none'){
    info.style.display =  'inline-block';
} else {
     info.style.display =  'none';
}

I`m have decided to use short hand statement like so;

 info.style.display === ''||info.style.display ==='none' ? info.style.display = 'inline-block' :info.style.display = 'none';

but still feeling thats too long and probably can be dried,

well, i have two approaches but each is not the right way:

// this solution works but requires two clicks first time run:

 info.style.display ==( ''||'none' ) ?info.style.display = 'inline-block' :info.style.display = 'none';

and :

 // this solution doesn't work:
  info.style.display == (''||'none' ? 'inline-block' : 'none');

Her is >>> My Plunker <<< Any idea on this please? Thank you..

Answer 1

实际上，这是使用此简短if-else语句的正确方法

info.style.display = (info.style.display === '' || info.style.display === 'none') ? 'inline-block' : 'none'; 

Answer 2

Since you're always assigning, just put the conditional on the right; you can also (if you really want to) use !info.style.display instead of info.style.display == '' :

info.style.display = !info.style.display || info.style.display === 'none' ? 'inline-block' : 'none';

Or even taking advantage of the curiously-powerful || operator though I'm not sure I'd do it:

info.style.display = (info.style.display || 'none') === 'none' ? 'inline-block' : 'none';

That works because '' || 'none' '' || 'none' results in 'none' , but 'anything_else' || 'none' 'anything_else' || 'none' results in 'anything_else' .