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Revision: 9100
at October 21, 2008 05:38 by liuran
Initial Code 
function isAlien(a) {
  return isObject(a) && typeof a.constructor != 'function';
} 
 

function isArray(a) {
  return isObject(a) && a.constructor == Array;
}

function isBoolean(a) {
  return typeof a == 'boolean';
}

function isEmpty(o) {
  var i, v;
  if (isObject(o)) {
    for (i in o) {
      v = o[i];
      if (isUndefined(v) && isFunction(v)) {
        return false;
      }
    }
  }
  return true;
}

function isFunction(a) {
  return typeof a == 'function';
}

function isNull(a) {
  return typeof a == 'object' && !a;
}

function isNumber(a) {
  return typeof a == 'number' && isFinite(a);
}

function isObject(a) {
  return (a && typeof a == 'object') || isFunction(a);
}

function isString(a) {
  return typeof a == 'string';
}

function isUndefined(a) {
  return typeof a == 'undefined';
}
Initial URL 

                                

                                                            

                                    

                                        

                                        Initial Description
                                        

                                    

                                    
to check the variant type in javascript. it's useful.

                                

                                                            

                                    

                                        

                                        Initial Title
                                        

                                    

                                    
the functions to check the variant type in javascript

                                

                                                            

                                    

                                        

                                        Initial Tags
                                        

                                    

                                    

                                

                                                            

                                    

                                        

                                        Initial Language
                                        

                                    

                                    
JavaScript