Collection
Collection
1，通过JS创建对象，属性，方法
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
var person = new Object(); //创建对象；
person.name = "lisi"; //创建属性；
person.age = 21;
person.family = ["lida", "lier", "wangwu"];
person.say = function () { //创建方法；
return this.name;
};
console.log (person.say()); //返回 lisi;
console.log (person.family[2]); // 返回wangwu;点击 "运行实例" 按钮查看在线实例
2.Jquery选择器的使用和$each循环
<!DOCTYPE html>
<html>
<head>
<title>jquery</title>
<script src="../jquery-3.4.1.min.js"></script>
</head>
<body>
<div class="main">
<div class="header">
<div class="nav">
<a id="home">首页</a>
<a>视频教程</a>
</div>
</div>
<div class="imgs">
<img src="">
</div>
</div>
</body>
<script>
var num = $('#home').html();
console.log(num);
var res = $('.main>div');
console.log(res.length);
$.each(res, function (i, v) {
console.log(v);
});
</script>
</html>点击 "运行实例" 按钮查看在线实例