var arr = [ "one", "two", "three", "four"]; $.each(arr, function(){ alert(this); }); 

var arr = [ "aaa", "bbb", "ccc" ]; $.each(arr, function(i,a){ alert(i); // i 是循環的序數alert(a); // a 是值}); var arr1 = [[1, 4, 3], [4, 6, 6], [7, 20, 9]] $.each(arr1, function(i, item){ alert(item[0]); }); 

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