1.引言
这几天维护了一个原生Js项目（jquery），没有使用vue框架等，没有弹框组件，所以自定义了一个弹框类
2.弹框效果
3.弹框对象MyLayer（文件名myLayer.js）
/**
* @param options 弹窗基本配置信息
* @constructor 构造方法
*/
function MyLayer(options) {
this.options = options ;
}
/**
* 打开弹窗
*/
MyLayer.prototype.openLayer = function () {
// 弹框窗div 绝对定位、设置zindex值1001
var background_layer = document.createElement("div");
background_layer.style.display = "none";
background_layer.style.position = "absolute";
background_layer.style.top = "0px";
background_layer.style.left = "0px";
background_layer.style.width = "100%";
background_layer.style.height = "100%";
background_layer.style.backgroundColor = "gray";
background_layer.style.zIndex = "1001";
background_layer.style.opacity = "0.8" ;
// 弹框顶层div 绝对定位、设置zindex值1002
var open_layer = document.createElement("div");
open_layer.style.display = "none";
open_layer.style.position = "absolute";
open_layer.style.top = this.options.top === undefined ? "10%" : this.options.top;
open_layer.style.left = this.options.left === undefined ? "10%" :this.options.left;
open_layer.style.width = this.options.width === undefined ? "80%" : this.options.width;
open_layer.style.height = this.options.height === undefined ? "80%" : this.options.height;
open_layer.style.border = "1px solid lightblue";
open_layer.style.borderRadius = "15px" ;
open_layer.style.boxShadow = "4px 4px 10px #171414";
open_layer.style.backgroundColor = "white";
open_layer.style.zIndex = "1002";
open_layer.style.overflow = "auto";
// 弹框标题行p---两个子节点--标题节点span---span_title--关闭节点span_close
var div_toolBar = document.createElement("div");
div_toolBar.style.textAlign = "right";
div_toolBar.style.paddingTop = "10px" ;
div_toolBar.style.backgroundColor = "aliceblue";
div_toolBar.style.height = "40px";
//标题节点span---span_title 子节点有一个文本节点
var span_title = document.createElement("span");
span_title.style.fontSize = "18px";
span_title.style.color = "blue" ;
span_title.style.float = "left";
span_title.style.marginLeft = "20px";
var span_title_content = document.createTextNode(this.options.title === undefined ? "" : this.options.title);
span_title.appendChild(span_title_content);
div_toolBar.appendChild(span_title);
// 关闭节点span_close 添加关闭点击事件，子节点也有一个文本节点
var span_close = document.createElement("span");
span_close.style.fontSize = "16px";
span_close.style.color = "blue" ;
span_close.style.cursor = "pointer";
span_close.style.marginRight = "20px";
span_close.onclick = function () {
open_layer.style.display = "none";
background_layer.style.display = "none";
};
var span_close_content = document.createTextNode("关闭");
span_close.appendChild(span_close_content);
div_toolBar.appendChild(span_close);
open_layer.appendChild(div_toolBar);
// 内容div 添加到open_layer中
var div_content = document.createElement("div");
div_content.style.textAlign = "center";
var content_area = document.createTextNode(this.options.content === undefined ? "" : this.options.content);
div_content.appendChild(content_area);
open_layer.appendChild(div_content);
// 内嵌页面iframe，添加到open_layer中
var iframe = document.createElement("iframe");
iframe.src = this.options.url === undefined ? "" : this.options.url;
iframe.style.width = "100%";
iframe.style.height = "100%";
open_layer.appendChild(iframe);
// open_layer, background_layer添加到网页中
document.body.appendChild(open_layer);
document.body.appendChild(background_layer);
// 在调用MyLayer实例的openLayer方法时显示弹框
open_layer.style.display = "block" ;
background_layer.style.display = "block";
};
4.html打开弹窗（实例化Mylayer类）
<html>
<head>
<title>自定义弹出窗口</title>
<script src="js/myLayer.js"></script>
<style type="text/css">
button{
width: 50px;
height: 50px;
border: 1px solid blue;
background-color: blue;
color: red;
border-radius: 5px;
-webkit-box-shadow: 2px 2px 2px gray;
-moz-box-shadow: 2px 2px 2px gray ;
box-shadow: 2px 2px 2px gray ;
}
button:hover{
background-color: green;
cursor: pointer;
}
</style>
<script type="text/javascript">
function openWindow() {
new MyLayer({
top:"10%",
left:"10%",
width:"80%",
height:"80%",
title:"我的标题",
content:"操作成功",
url: "https://juejin.cn/"
}).openLayer();
}
</script>
</head>
<body>
<button type="button" onclick="openWindow()">打开弹窗</button>
</body>
</html>
