you can redeclare undefined using scope wrappers: (function($, undefined){ /* undefined is 'abc' in here */ })(jQuery, 'abc'); , which is why ppl complain that ... ... <看更多>

The primitive values null and undefined have a distinct difference that should be used. But how to you tell ... ... <看更多>

If you have been working with other programming languages such as Java or C#, you may find that these languages have a null value. JavaScript also has null ... ... <看更多>

Right now I am using should.equal null and should.equal undefined. Would it be better if you could use these assertions directly? ... <看更多>