Detailed explanation of jQuery $.each traversal object and array methods

This time I will bring you a detailed explanation of jQuery $.eachTraversing objects and array methods. What are the precautions for jQuery $.each traversing objects and arrays? The following is a practical case. , let’s take a look.

Through it, you can traverse the attribute 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 parameters:

1. Traverse the object (with additional parameters )

$.each(Object, function(p1, p2) {
     this;       //这里的this指向每次遍历中Object的当前属性值     p1; p2;     //访问附加参数
}, ['参数1', '参数2']);

2, Traverse the array(with attached parameters)

$.each(Array, function(p1, p2){
     this;       //这里的this指向每次遍历中Array的当前元素     
     p1; p2;     //访问附加参数}, ['参数1', '参数2']);

3, Traverse the object (without additional parameters) )

$.each(Object, function(name, value) {
     this;       //this指向当前属性的值     
      name;      //name表示Object当前属性的名称     
      value;     //value表示Object当前属性的值});[code]

4. Traverse the array (no additional parameters)[code]

$.each(Array, function(i, value) {
     this;      //this指向当前元素     
     i;         //i表示Array当前下标     
     value;     //value表示Array当前元素
});

The following are some common uses of jQuery's each method

 var arr = [ "one", "two", "three", "four"];     
 $.each(arr, function(){     
    alert(this);     
 });     
//上面这个each输出的结果分别为：one,two,three,four

var arr1 = [[1, 4, 3], [4, 6, 6], [7, 20, 9]]     
$.each(arr1, function(i, item){     
   alert(item[0]);     
});     
//其实arr1为一个
二维数组
，item相当于取每一个
一维数组
，   
//item[0]相对于取每一个一维数组里的第一个值   
//所以上面这个each输出分别为：1   4   7

var obj = { one:1, two:2, three:3, four:4};     
$.each(obj, function(key, val) {     
    alert(obj[key]);           
});   
//这个each就有更厉害了，能循环每一个属性     
//输出结果为：1   2  3  4

I believe I have read the case in this article You have mastered the method. For more exciting information, please pay attention to other related articles on the php Chinese website!

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