Here you can find the source of in(ele)
Array.prototype.in = function(ele) { for (var i=0; i<this.length; i++) { if (this[i] == ele) { return true; }// w w w . ja va 2 s . com } return false; }
Array.prototype.in = function(elementToFind) { for(var i = 0 ; i < this.length ; i++) { if(this[i] === elementToFind) { return true; return false; };
Array.prototype.inArr = function (item){ for (var i = 0; i < this.length; i++){ if(this[i] === item){ return true;
Array.prototype.inArray = function() { for(var j in this) { if(this[j] == arguments[0]) { return true; return false;
Array.prototype.inArray = function() for (var j in this) { if (this[j] == arguments[0]) { return true; return false;