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

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