JavaScript中的setTimeout不起作用
[英]setTimeout in JavaScript doesn't work
问题描述
Strange issue here, I don't see why it isn't working. 
这里出现奇怪的问题，我不明白为什么它不起作用。 But basically the alert is fire as soon as I press the button, there is no 5 second delay at all! 但是基本上，只要我按一下按钮，警报就会触发，根本没有5秒的延迟！
<html>
<head>
<title>Testing Page</title>
</head>
<script type="text/javascript">
function testing() {
var delay = 5000;
setTimeout(alert("5 seconds later..."),delay);
}
</script>
<body>
<input type="button" value="Run Function" onClick="testing()">
</body>
</html>
2 个解决方案
解决方案1
7 已采纳 2014-01-13 02:19:29
function testing() {
var delay = 5000;
setTimeout(function(){alert("5 seconds later...");},delay);
}
Need to wrap it in a function so the alert is not immediately executed. 需要将其包装在一个函数中，以便不会立即执行警报。
Check out the MDN reference for more information regarding how to use setTimeout 查看MDN参考以获取有关如何使用setTimeout更多信息。
解决方案2
4 2014-01-13 02:20:18
The setTimeout function is used as follows: setTimeout函数的用法如下：
setTimeout(<function>, <delay>);
The first parameter is a function. 第一个参数是一个函数。 What you're doing is giving it the value of alert(..); 您正在做的就是为其赋予alert（..）的值；
Change it to: 更改为：
setTimeout(function(){ alert("5 seconds later..."); }, delay);
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