将JavaScript Cookie分配给变量

Question

I am trying to assign a js cookie to a variable so that I can check if that cookie has been set or not:

(function(){
     var cookieSet = document.cookie ='cookie1=test';

     if (cookieSet == null) {
          console.log('hide');
     }
     if (cookieSet) {
         console.log('show');
          HB.BestBreakfast.showPanelAndHideOthers("commentBox");
     }

})();

however it's always showing 'show'.

Where am I wrong?

Answer 1

var cookieSet = document.cookie ='cookie1=test';

This line assigns a value to document.cookie , then it assigns that value to cookieSet .

This means that cookieSet will always have a value.

Perhaps you want something like:

var cookieSet = document.cookie;
document.cookie ='cookie1=test';

So cookieSet gets the old value of document.cookie and then you assign a new value.

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Additionally, if there are no cookies set, then document.cookie will be an empty string and not null .

You need to change your test to:

if (cookieSet == "") {