JavaScript Comparison and Logical Operators

Ref:http://www.w3schools.com/js/js_comparisons.asp

 var r = 1;
 var result = r || 2;
 console.log(result);
 //output: 1

 r = 0;
 result = r || 2;
 console.log(result);
 //output: 2

 r = 0;
 result = r || "string";
 console.log(result);
 //output: string