如何创建“& first-load&"HTML或Javascript事件? [英] How can I create a "first-load" event in html or Javascript?
问题描述
我是初学者.我有个主意.我想实现这样的事件.有可能吗?
I'm starter. I have an idea. I want to implement an event like this. Is it possible?
<html>
<head>
<title>First visit event</title>
<script>
function do_something()
{
alert("Hello my friend. This is your first visit.");
}
</script>
</head>
<body firstVisitEvent="do_something()">
</body>
推荐答案
在加载时使用.它将在页面加载时执行，并且您将看到警报.祝你好运.
Use on load. It will execute when the page loads, and you will see your alert. Good luck with your knowledge.
<html>
<head>
<script>
function load()
{
alert("Page is loaded");
}
</script>
</head>
<body onload="load()">
<h1>Hello World!</h1>
</body>
</html>
您可以获取更多信息并设置cookie来查看这是否是用户的第一次，但是我不确定您是否处于该级别，但是无论如何:
You can get more advance and set cookies to see if it's the user's first time, but I'm not sure you're at that level yet, but anyways:
例如，您可以设置一个localStorage属性，例如
You could for example set a localStorage property like
if(!localStorage["alertdisplayed"]) {
alert("Your text")
localStorage["alertdisplayed"] = true
}
请注意，旧版浏览器不支持localStorage.
另一种选择是设置Cookie并检查其存在性
An alternative would be setting a Cookie and check against its existence
如果您不知道如何使用javascript设置/获取cookie，我建议阅读此文章:
If you don't know how to set / get cookies with javascript, i would suggest, reading this article: https://developer.mozilla.org/en-US/docs/Web/API/document.cookie?redirectlocale=en-US&redirectslug=DOM%2Fdocument.cookie
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