https://developer.mozilla.org/zh-CN/docs/Web/API/EventTarget/dispatchEvent
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script>
var myEvent = new CustomEvent('event_name', {
detail: { title: 'This is title!'},
});
window.addEventListener('event_name', function(event){
console.log('标题：', event.detail.title);
});
// 随后在对应的元素上触发该事件
if(window.dispatchEvent) {
setTimeout(()=>{
window.dispatchEvent(myEvent);
}, 2000)
} else {
window.fireEvent(myEvent);
}
</script>
</body>
</html>
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