<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>点击空白处弹窗消失</title>
<style>
*{
margin: 0;
padding: 0;
}
#app{
width: 300px;
margin: 40px auto;
}
.input-text{
width: 100%;
box-sizing: border-box;
}
.content{
height: 300px;
border: 1px solid black;
}
.hide{
display: none;
}
</style>
</head>
<body>
<div id="app">
<input type="text" class="input-text"/>
<div class="content hide">
<div>
<button type="button">确定</button>
</div>
</div>
</div>
<script>
//事件委托就是利用事件冒泡特性，给父元素绑定事件
//parent.contains(child) 判断是否是某个节点的子节点
//e.target 触发事件的源节点
document.onclick = function(e){
e = window.event || e;
let parentApp = document.getElementById('app');
if(parentApp.contains(e.target)){
console.log("app元素内，移除.hide");
document.querySelectorAll('.content')[0].classList.remove("hide")
}else{
console.log("app元素外，添加.hide");
document.querySelectorAll('.content')[0].classList.add("hide")
}
}
//自定义contains方法
var cusContains = function(parNode,childNode){
//子节点不能是html或body标签
while (childNode && !/HTML|BODY/.test(childNode.nodeName)){
if (childNode == parNode){
return true;
}
childNode = childNode.parentNode;
}
return false;
}
</script>
</body>
</html>
