A brief discussion on the each method $.each, this.each, $.fn.each in jquery

jquery.each method

Method one

$("img").each(function(i,elem){
　// i 下标 从零开始，
　// elem == this
　// $(elem).toggleClass("example");
 $(this).toggleClass("example");
});

Method two

$.each([1,2,3,4],function(){
　　//$(this)==数组中的每一个数组（如果数组是对象，就是对象）
});

Method three

The scene should be a little different

this.each(function(){
 
})

Extended jQuery object method

should be

jQuery.fn.Fun=function(){
　　//this==$("img") 和下面的调用方法相结合，如果是其他对象就是其他对象
　　this.each(function(){
　　
　　$(this)==$("img")[0],
　　//$(this)==$("img")[1],
　//　.......
 
　　})
　　
 
}
调用
$("img").Fun();

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