javascript 如何处理javascript中的点击事件？
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How to handle click event in javascript?
提问by Stack Guru
Today is my first day at a new job (a Front End Lead on a large website.) One of my tasks is to implement a button that fires an event when it's clicked. I had no clue, so after googling a bit, I came up with this:
今天是我从事新工作的第一天（大型网站的前端负责人）。我的任务之一是实现一个按钮，该按钮在单击时触发事件。我不知道，所以在谷歌搜索了一下之后，我想出了这个：
<html>
<head>
<script type="text/javascript">
function popup();
{
alert("Hello World") ==> alert("Hello World");
}
</script>
</head>
<body>
<input type="button" value="Click Me!" onclick="popup()"></input><br></br>
</html>
</body>
The problem is, when I click my button, nothing happens.
问题是，当我单击按钮时，什么也没有发生。
EDITUpdated based on MICHEL's comments
编辑根据米歇尔的评论更新
回答by Naftali aka Neal
remove the semi-colon:
删除分号：
function popup()
{
alert("Hello World")
}
that should work ^_^
那应该工作^_^
see it working here: http://jsfiddle.net/maniator/fNeJh/
看到它在这里工作：http: //jsfiddle.net/maniator/fNeJh/
回答by Matt Ball
Your HTML is invalid. Change
您的 HTML 无效。改变
</html>
</body>
to
到
</body>
</html>
Also, the <br>tag has no content, so you don't need a closing tag at all (for HTML) or you can write it as a self-closing tag: <br/>.
此外，该<br>标签没有内容，因此您根本不需要结束标签（对于 HTML），或者您可以将其编写为自结束标签：<br/>。
As far as the JavaScript error goes, Neal's answer is correct.
就 JavaScript 错误而言，Neal 的回答是正确的。
回答by Scherbius.com
This should work
这应该工作
<html>
<head>
</head>
<body>
<script type="text/javascript">
function popup()
{
alert("Hello World");
}
</script>
<input type="button" value="Click Me!" onclick="popup()"><br/><br/>
</body>
</html>
回答by Michel
Remove semi-colon after
删除分号后
Bad :
坏的 ：
function popup();
Good :
好的 ：
function popup()
You might want to add one after alert("Hello World") ==> alert("Hello World");
您可能想在 alert("Hello World") ==> alert("Hello World"); 之后添加一个
回答by Maxim Dsouza
function should not have a semi colon after its declaration ... A simple tutorial on javascript would give you a start on javascript...
函数在声明后不应该有分号......一个简单的javascript教程会让你开始学习javascript......
