var list1 = ["number","name"];var list2 = ["36","Crown","15","Faker","Swift","68","Dandy"];var map_demo = { name: "John", lang: "JS" };

1.最常用的for循环

for(var i=0;i        console.info(i +":"+ list2 [i]);

}

小结：很常见也很常用，效率也不差，但不能遍历map。

2.for...in...遍历List/map

//遍历mapfor(var key in map_demo){        console.info(key+":"+map_demo[key]);}//遍历Listfor(var index in list2){        console.info(index+":"+list2[index]);

}

小结：对于List来说，能不用for...in就不要用，效率低下。

3.forEach遍历List

list2.forEach(function (element, index, array) {        console.info(element); //当前元素的值        console.info(index);   //当前下标        console.info(array);  //数组本身 

});

小结：和for循环效率差不多。

4.$.each()遍历List/map

//遍历List$.each(list2,function(index,items){        console.info(index+":"+items);});//遍历map$.each(map_demo,function(key,value){        console.info("key: " + key + ", Value: " + value );

})

5.$.map()遍历List/map

//遍历Listvar new_list = $.map(list2,function(items,index){        return items+"!";})console.info(new_list);    //遍历map$.map(map_demo,function(key,value){      console.log(key+":"+value);  

}); 

小结：$.map()写法和$.each()类似,但对list的遍历时，参数顺序和$.each()是相反的，并且可以带返回值。对map的遍历和$.each()一样