What is the difference between $().each and $.each in jquery?

Difference: When traversing the DOM, the $(selector).each() function is usually used, which is often used in DOM processing; when traversing the data, the $.each() function is usually used. This function is commonly used in data processing.

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In jquery, traversing objects and arrays is often used To $().each and $.each(), two methods.

$().each is often used in DOM processing. If the page has multiple input tags of checkbox type, use $().each to process multiple checkbooks, for example:

{
if($(this).attr(‘checked’)==true)
{
//一些操作代码
}
回调函数是可以传递参数，i就为遍历的索引。

Traversing an array is usually done with $.each() , for example:

$.each([{name:"limeng",email:"xfjylimeng"},{name:"hehe",email:"xfjylimeng"}],function(i,n)
{
alert("索引:"+i+"对应值为："+n.name);
});

The parameter i is the traversal index value, n is the current traversal object.

var arr1 = [ "one", "two", "three", "four", "five" ];
$.each(arr1, function(){
alert(this);
});

Output: one two three four five

var arr2 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
$.each(arr2, function(i, item){
alert(item[0]);
});

Output: 1 4 7

var obj = { one:1, two:2, three:3, four:4, five:5 };
$.each(obj, function(key, val) {
alert(obj[key]);
});

Output: 1 2 3 4 5

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