<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#box {
width: 300px;
height: 300px;
border: 1px solid red;
margin: 100px auto;
position: relative;
overflow: hidden;
}
.point {
/* 解决鼠标点击圆点不在鼠标指向的地方，这是因为存在margin */
margin: 0 0;
width: 5px;
height: 5px;
border-radius: 50%;
background-color: red;
position: absolute;
}
</style>
</head>
<body>
//如果是一个图片，以下内容正常定义，只需要把box.appendChild(p)改为box.parentNode.appendChild(p)就行了;
<div id="box"></div>
<script>
var box = document.getElementById("box");
// 定义一个数组变量
var arr = [];
box.addEventListener("click", function (event) {
var p = document.createElement("p");
p.className = "point";
p.style.left = event.pageX - box.offsetLeft + "px";
p.style.top = event.pageY - box.offsetTop + "px";
box.appendChild(p);
// 将圆点push到数组里去，因为数组属于引用类型，故能达到创建多个圆点
arr.push(p);
});
</script>
</body>
</html>Representaciones:
