$.each traverses the attribute values ​​of objects and arrays and processes them

Through it, you can iterate over the property values ​​of objects and arrays and process them.

Instructions for use

The effect of each function is not completely consistent according to the type of parameter:

1. Traversing the object (with additional parameters)

 $.each(Object, function(p1, p2) {this; //This here points to the current property value of Object in each traversal; p2; //Access additional parameters}, ['parameter 1', 'parameter 2']);

2. Iterate over the array (with attachment parameters)

 $.each(Array, function(p1, p2){this; //This here points to the current element of Array in each traversal; p2; //Access additional parameters}, ['parameter 1', 'parameter 2']);

3. Traversing the object (no additional parameters)

 $.each(Object, function(name, value) {this; //this points to the value of the current attribute; //name represents the name of the current attribute of the Object; //value represents the value of the current attribute of the Object});

4. Iterate over the array (no additional parameters)

 $.each(Array, function(i, value) {this; //this points to the current element i; //i represents the current subscript value of Array; //value represents the current element of Array});

Let me mention several common uses of jQuery's each method

Js code

 var arr = [ "one", "two", "three", "four"]; $.each(arr, function(){ alert(this); }); //The results of the above each output are: one, two, three, four 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, 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 above each output is: 1 4 7 var obj = { one:1, two:2, three:3, four:4}; $.each(obj, function(key, val) { alert(obj[key]); }); //This each is even more powerful, and can loop every attribute//The output result is: 1 2 3 4

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