如何创建一个“第一负载”事件在html或javascript？ [英] How can I create a "first-load" event in html or javascript?
问题描述
< html>
< head>
< title>首次访问事件< / title>
< script>
函数do_something（）
{
alert（你好我的朋友，这是你的第一次访问）;
}
< / script>
< / head>
< body firstVisitEvent =do_something（）>
< / body>
在加载时使用。它将在页面加载时执行，您将看到您的警报。祝你有所了解。
< html>
< head>
< script>
function load（）
{
alert（Page is loaded）;
}
< / script>
< / head>
< body onload =load（）>
< h1> Hello World！< / h1>
< / body>
< / html>
编辑：您可以获得更多提前和设置Cookie，看看它是用户的第一次，但是不知道你在那个级别，但无论如何：
你可以设置一个localStorage属性，如
$ b $如果（！localStorage [alertdisplayed]）{
alert（Your text）
localStorage [alertdisplayed] = true
}
请注意，旧版浏览器不支持localStorage。 / p>
另一种方法是设置Cookie并检查其存在
如果您不知道如何设置/ javascript获取cookie，我建议，阅读这篇文章： https://developer.mozilla.org/en-US/docs/Web/API/document.cookie?redirectlocale=en-US&redirectslug=DOM%2Fdocument.cookie
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>
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>
Edit: 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:
You could for example set a localStorage property like
if(!localStorage["alertdisplayed"]) {
alert("Your text")
localStorage["alertdisplayed"] = true
}
Note that localStorage isn't supported by older Browsers.
An alternative would be setting a Cookie and check against its existence
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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