Javascript Array contains(o)

Array.prototype.contains = function(o) {
 for (var i = 0; i < this.length; i++) {
  if (this[i] == o) {
   return true;/*from  w  w  w  .  jav a  2  s  .co m*/
  }
 }
 return false;
}

function getContextPath() {
 var pathName = document.location.pathname;
 var index = pathName.substr(1).indexOf("/");
 var result = pathName.substr(0,index+1);
 return result;
}

/**//from w  ww  .j  a  va2  s  .  c  o m
 * judge the target in Array
 * 
 * @param o the target
 * @returns {Boolean}
 */
Array.prototype.contains = function(o) {
 var flag = false;
 for (var i = 0; i < this.length; i++) {
  if (this[i] == o) {
   flag = true;
   break;
  }
 }
 return flag;
};