(variable))) in javascript and jquery. function myFunction() { var data; //The Values can be like as null, blank, ... ... <看更多>

A helper method to check for null, undefined or empty string values. - isNullUndefinedOrEmpty().js. ... <看更多>

In programming, truthiness or falsiness is that quality of those boolean expressions which don't resolve to an actual boolean value, ... ... <看更多>

Besides false , 0 , an empty string ( '' ), undefined , NaN , null is a falsy value. It means that JavaScript will coerce null to false in conditionals. ... <看更多>