Find all indexes of an item of an array with javascript(js)

findItemAllIndexes.js

var array = ['hi','asdfa','ti' , 'rad' , 'hi' , 'asasd' , 'hi'];
function itemIndexs(array){
	this.array = array;
	this.findIndexs = function(item){
		var tempArray = this.array , indexes = [];
		while(tempArray.indexOf(item) >= 0){
			var firstOcarence = tempArray.indexOf(item) , lastOcarence = tempArray.lastIndexOf(item);
			if(firstOcarence == lastOcarence){
				indexes.push(firstOcarence + 1);
				tempArray[firstOcarence] = null;
			}else{
				indexes.push(firstOcarence+1);
				indexes.push(lastOcarence+1);
				tempArray[firstOcarence] = null;
				tempArray[lastOcarence] = null;
			}
		}
		return indexes.length > 0 ? indexes : false;
	};
};

var newArrayObject = new itemIndexs(array);
console.log(newArrayObject.findIndexs("hi"));