几种Jquery each用法

Js代码

var arr1 = [ "one", "two", "three", "four", "five" ];       
$.each(arr1, function(){       
     alert(this);       
});       
输出：one    two   three   four    five       
var arr2 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]       
$.each(arr2, function(i, item){       
     alert(item[0]);       
});       
输出：1    4    7       
var obj = { one:1, two:2, three:3, four:4, five:5 };       
$.each(obj, function(key, val) {       
     alert(obj[key]);             
});       
输出：1    2   3   4   5      
  
$.each($("input:hidden"), function(){      
    alert(this.name);    
});    
$.each($("input:hidden"), function(){      
    alert(this.value);    
});  

JQuery 的each 用法,收集一下