jQuery check if two values is blank

I have three values:

var tbb = $("#total1 span").text();
var tmb = $("#total2 span").text();
var tab = $("#total3 span").text();

Each of them could be blank.

What is the better way in javascript/jquery check if two of these values is blank?

UPDATE

here is what i mean, my a bit ugly and a "lot of lines" solution

var i = 0;
            if (tab != "") {
                i++;
            }

            if (tmb != "") {
                i++;
            }

            if (tbb != "") {
                i++;
   开发者_StackOverflow社区         }

            if (i >= 2) {
                //do something
            }

Any better thoughts?

if(tbb == null || tbb == ''){...}

And the same for the rest.

var twoAreEmpty = $("#total1, #total2, #total3").find("span:empty").length === 2;

var twoblank = 
  $("#tota11 span, #total2 span, #total3 span")
    .filter(function(index){
      return !$(this).text().replace(/^\s+|\s+$/g, '');
    })
    .length === 2;

Also, you probably mean #total1, not #tota11 - just sayin.

if (tab == "") should be enough shouldn't it?

Does .text() ever return blank?

var filtered = [tmb, tbb, tab].filter(function( str ) {
    return !str.length;
});

if( filtered.length === 2 ) {
    console.log('yay, two empty values: ', filtered); 
}

Just try it.

var i = 0; 
if(tbb.length == 0 )
{  
    i++
}
 if(tmb.length == 0 )
{  
    i++
} 
if(tab.length == 0 )
{  
    i++
}  
if(i >=2)  
{
   //perform operation
}

It's been a while, but this is going to be a single-line solution for what you want.

if (((tab == '' ? 1 : 0) + (tmb == '' ? 1 : 0) + (tbb == '' ? 1 : 0)) > 1){
    // Do Something
}

All valid answers, but forgetting about undefined :)

if(tbb === '' || tbb === null || tbb === undefined){ // do stuff };

I'd recommend making it a function which could return true/false :)