窗口 onload 和窗口 onfocus

发布于 2024-11-16 07:16:57 字数 281 浏览 3 评论 0原文

window.onload = function() {
window.onfocus = alert('example');
}

我遇到了这个问题，有人可以帮忙吗？我是 javascript 新手，希望能正常工作，但事实并非如此:)

我想在页面完全加载并处于活动状态时提醒“示例”一词，但不想提醒“示例”一词如果页面已完全加载但未处于活动状态 (onblur)。当用户回来时（onfocus），然后提醒“example”。

原文

window.onload = function() {
window.onfocus = alert('example');
}

I've met this problem, anyone can help?
I'm new at javascript and made this expecting to work properly, but it does not :)

I want to alert the word "example" when the page is fully loaded and active, but don't want to alert the word "example" if the page is fully loaded but not active (onblur).
And when user comes back (onfocus) then alert "example".

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虫児飞 2024-11-23 07:16:57

您的代码立即调用alert函数，并将其返回值分配给onfocus。

您需要将 onfocus 设置为调用 alert 的匿名函数：

window.onload = function() { 
    window.onfocus = function() { alert('example'); };
};

Your code calls the alert function immediately and assigns its return value to onfocus.

You need to set onfocus to an anonymous function that calls alert:

window.onload = function() { 
    window.onfocus = function() { alert('example'); };
};

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时光匆匆的小流年 2024-11-23 07:16:57

试试这个：

var hasFocus=false;
var loaded = false;

window.onload = function() {
    if (hasFocus) alert('example');
    loaded = true;
};
window.onfocus = function() { 
    if (loaded) alert('example');
    hasFocus = true;
};
window.onblur = function() { hasFocus = false; };

Try this:

var hasFocus=false;
var loaded = false;

window.onload = function() {
    if (hasFocus) alert('example');
    loaded = true;
};
window.onfocus = function() { 
    if (loaded) alert('example');
    hasFocus = true;
};
window.onblur = function() { hasFocus = false; };

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嗫嚅 2024-11-23 07:16:57

window.onload = function() { 
    window.onfocus = function() {
        alert('example'); 
    }
}

window.onload = function() { 
    window.onfocus = function() {
        alert('example'); 
    }
}

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时光暖心i 2024-11-23 07:16:57

这是您需要的 JavaScript。

<html>
<head>
    <script type="text/javascript">
        window.onload = init;

        function init() { window.onfocus = whenInFocus; window.onblur = function() {window.onfocus = whenInFocus;};};
        function whenInFocus() {alert('example'); window.onfocus = null;};
    </script>

</head>
<body>
    hello
</body>
</html>

Here is the javascript that you need.

<html>
<head>
    <script type="text/javascript">
        window.onload = init;

        function init() { window.onfocus = whenInFocus; window.onblur = function() {window.onfocus = whenInFocus;};};
        function whenInFocus() {alert('example'); window.onfocus = null;};
    </script>

</head>
<body>
    hello
</body>
</html>

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