The code in $(document).ready() is executed after the page content is loaded. If the code is written directly into the script tag, the code inside the script tag will be executed when the page is loaded. At this time, if the code executed in your tag calls code or DOM that has not yet been loaded, an error will be reported. Of course, if you put the script tag at the end of the page, there will be no problem. The effect is the same as ready.
$(document).ready(function(){}) can be abbreviated as $(function(){});
After clicking on the paragraph, this paragraph is hidden:
<html>
<head>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p>If you click on me, I will disappear.</p>
</body>
</html>
If $(document).ready(function() {}); is removed, the paragraph cannot be hidden:
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$("p").click(function(){
$(this).hide();
});
</script>
</head>
<body>
<p>If you click on me, I will disappear.</p>
</body>
</html>
But if you put the script at the end of the page, the hidden effect can be restored:
<html>
<head>
</head>
<body>
<p>If you click on me, I will disappear.</p>
</body>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$("p").click(function(){
$(this).hide();
});
</script>
</html>
Summary:
The code in $(document).ready is executed after the page content is loaded. You write it directly into the script tag. When the page is loaded, the script tag will execute the code inside. If you If the executed code calls code or DOM that has not been loaded yet, an error will be reported,
Of course, if you put the script tag at the end of the page, then there will be no problem and the effect will be similar to ready
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jquery on()有几个参数Apr 21, 2022 am 11:29 AMon()方法有4个参数：1、第一个参数不可省略，规定要从被选元素添加的一个或多个事件或命名空间；2、第二个参数可省略，规定元素的事件处理程序；3、第三个参数可省略，规定传递到函数的额外数据；4、第四个参数可省略，规定当事件发生时运行的函数。
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