jQuery: why does the element exist on the page on document ready? [closed]

StackOverflow https://stackoverflow.com/questions/14690790

题

I'm curious why the code bellow displays "Why this text appears on load" on the page?

<!DOCTYPE html>
<html lang="en">
<head>
<title>Hello title</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script>
$(function() {
    $('<h4>Why this text appears on load</h4>').click(function() {
        alert('3');
    }).insertAfter($('h1'));
});
</script>
</head>
<body>
    <h1>H</h1>
</body>
</html>
有帮助吗？

解决方案 2

$(function(){}) is shorthand for $(document).ready(function(){}). So, when the document (the DOM) is ready, your code runs.

You create an <h4> element, assign a click handler to it, then append it after each <h1> on the page.

其他提示

In jquery.js, jQuery is listening for the DOM to be ready by either using the DOMContentLoaded event, or the document.onreadystatechange event. Once the dom is ready, all callbacks that have been passed to .ready() are triggered, and any calls to .ready() that come after that are immediately executed.

Note: $(function(){}) is equivalent to $(document).ready(function(){})

$('<h4>Why this text appears on load</h4>') is inserted after insertAfter($('h1')); on document.ready()

$(function() {}) is short form of document.ready(function() {}) which is executed as soon as the html element in the page are available.

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