一、选择器+遍历(dom操作)分为两种:

第一种:

$('div').each(function (i){

i就是索引值

this 表示获取遍历每一个dom对象

});

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
div{
width:400px;
border: 1px solid #000;
height:400px;
margin:50px auto;
}
ul{
list-style:none;
} </style>
</head>
<body>
<div>
<ul>
<li>0</li>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
</ul>
</div>
</body>
</html>
<script src="js/jquery-1.12.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
$('div>ul>li').each(function(i){
console.log(i);
}) </script>

jquery 之 $().each和$.each()-LMLPHP

第二种:

$('div').each(function (index,domEle){

index就是索引值

domEle 表示获取遍历每一个dom对象 //当前被选中的元素(也可以用this代替),如果用this代替,可以不写这个参数。

});

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
div{
width:550px;
border:1px solid #000;
overflow: hidden;
}
div p{
width:100px;
height:100px;
background: red;
float:left;
margin-right:10px;
} </style>
</head>
<body>
<div>
<p>0</p>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
</div>
<div>
<p>0</p>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
</div>
<div>
<p>0</p>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
</div> </body>
</html>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$('div').each(function(index,ele){
$(this).children().eq(1).css('backgroundColor','pink');
}) </script>

jquery 之 $().each和$.each()-LMLPHP

二、遍历$.each()   (对象遍历)

1)先获取某个集合对象

2)遍历集合对象的每一个元素

var d=$("div");

$.each(d,function (index,domEle){

d是要遍历的集合

index就是索引值

domEle 表示获取遍历每一个dom对象

});

$.each([{name:"vico",email:"[email protected]"},{name:"holly",email:"[email protected]"}],function(index,ele){
alert('索引:'+index+'对应的值为:'+ele.name)
})

输出  vico    holly

var arr1 = [ "one", "two", "three", "four", "five" ];
$.each(arr1, function(){
alert(this);
});
输出:one two three four five var arr2 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
$.each(arr2, function(i, item){
alert(item[0]);
});
输出:1 4 7 var obj = { one:1, two:2, three:3, four:4, five:5 };
$.each(obj, function(key, val) {
alert(obj[key]);
});
输出:1 2 3 4 5
05-28 21:45