jQuery $.each的用法说明

var arr1 = [ "a", "b", "c", "d", "e" ];
$.each(arr1, function(){
alert(this);
});

var arr2 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
$.each(arr2, function(i, item){
alert(item[0]);
});

var obj = { one:1, two:2, three:3, four:4, five:5 };
$.each(obj, function(key, val) {
alert(obj[key]);
});