var a= $("input").map(function(){return $(this).val()});
var b= $("input").map(function(){return $(this).val()}).get();
console.log(a);//jquery对象数组,拥有document上下文和jquery方法
console.log(b)//普通数组
a.each(function(k,v){alert(v)});//正常弹出
b.each(function(k,v){alert(v))//报错:Object [object Array] has no method 'each'