~~~ function getEleCount (obj, ele) { var num = 0; for (var i = 0, len = obj.length; i < len; i++) { if (ele == obj[i]) { num++; } } return num; } ​ getEleCount('asd56+asdasdwqe','a') // 3 getEleCount([1,2,3,4,5,66,77,22,55,22],22) // 2 ~~~