js判断数组是否包含某个字符串变量的实例

　　var arr=[
  {
  "status":"success",
  "activerUserData":
  [
   {"activeUser":"张珊","activeUserMobile":"15542175311","countNum":113,"optionTime":1511341097555},
   {"activeUserMobile":"15545932121","countNum":62,"optionTime":1511340911802}
   
  ]
  }
 ]

var arr = [1,2,3];
console.log(arr.indexOf(1)); // 返回0
console.log(arr.indexOf(5)); // 返回-1