Detailed explanation of the use of $.each in jQuery_jquery

Through it, you can traverse the attribute values ​​​​of objects and arrays and process them.

Instructions for use

The effects of each function are not completely consistent depending on the type of parameters:

1. Traverse objects (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 attachment 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 objects (no 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
});

4. Traverse the array (no additional parameters)

$.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
});

Here are some common uses of jQuery’s each method

Js code

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

This article ends here, briefly describing jQuery. I hope you guys like how to use $.each.