如何创建一个事件侦听器来检测布尔变量是否为真? [英] How do you make an event listener that detects if a boolean variable becomes true?
问题描述
例如，我有 var menu_ready = false;.我有一个 ajax 函数，它在 ajax 完成后将 menu_ready 设置为 true:
//这里设置事件监听$(...).load(..., function() {...菜单就绪=真；}如何设置等待 menu_ready 为真的事件侦听器?
警告 我下面的回答来自五月花号航行之前的一段时间.这是一个糟糕的答案.我无法删除它，因为它已被接受，并且系统不会让我删除已接受的答案.我可以对其进行编辑以使其变得更好，但是当其他人在下面给出可靠的答案时，为什么要这样做呢?底线:滚动过去，过上更充实的生活.:)
<BAD-ANSWER><块引用>
一种方法是持续轮询:
function checkMenu() {如果(！menu_ready){setTimeout(checkMenu();", 1000);返回;} 别的 {//menu_ready 是真的，所以在这里做你需要做的.}}还有……
<body onload="checkMenu();"></BAD-ANSWER>For example, I have var menu_ready = false;. I have an ajax function that sets menu_ready to true when the ajax stuff is done:
//set up event listener here
$(...).load(..., function() {
...
menu_ready = true;
}
How do I set up an event listener that waits for menu_ready to be true?
WARNING My answer below is from a period slightly prior to the sailing of the Mayflower. It's a bad answer. I can't remove it because it was accepted, and the system won't let me remove an accepted answer. I could edit it to make it better, but why do that when others have given solid answers below? Bottom line: scroll past this to a more fulfilling life. :)
<BAD-ANSWER>
One way is continual polling:
function checkMenu() { if (!menu_ready) { setTimeout("checkMenu();", 1000); return; } else { // menu_ready is true, so do what you need to do here. } }and...
<body onload="checkMenu();">
</BAD-ANSWER>
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