How to use $.each in Jquery to obtain various return type data_jquery

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

The output results of each of the above are: one, two, three, four

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

In fact, arr1 is a two-dimensional array, and item is equivalent to taking each one-dimensional array,
item[0] is relative to taking the first value in each one-dimensional array
So the output of each above is: 1 4 7

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

The output result is: 1 2 3 4

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