自定义dom事件监听
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<!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>
</head>
<body>
<button>按我触发自定义事件</button>
<script>
var event = new Event("myEvent");
var btn = document.querySelector("button");
btn.addEventListener("myEvent", function () {
console.log("myEvent")
})
btn.onclick=()=>{
btn.dispatchEvent(event)
}
</script>
</body>
</html>
