封装一个方法判断数组和对象还有字符串--齐枭飞

  //封装一个方法判断数组和对象
 var o = { 
              'name':'lee'
            };

var b ='22';

var a = ['reg','blue'];

function c(name,age){
         this.name = name;
         this.age = age;
 }
 
var c = new c('kingw','27');
console.log(Object.prototype.toString.call(a));//[object Array]
console.log(Object.prototype.toString.call(o));//[Object Object]
console.log(Object.prototype.toString.call(c));//[Object Object]
console.log(Object.prototype.toString.call(b));//[object Array]

function isType(obj){
       var type = Object.prototype.toString.call(obj);
       if(type == '[object Array]'){
              return 'Array';
        }else if(type == '[object Object]'){
              return "Object"
        }else if(type == '[object Stringt]'){
              return "string"
        }else{
              return 'param is no object type';
        }
}
console.log(isType(o));//Object
console.log(isType(a));//Array
 [object Array]
 [object Object]
[object Object]
[object String]
 Object
 Array
undefined
console.log(isType(b));
param is no object type
undefined
希望大家看得懂！！！！！！！！！！！！！！！！！！！！