How to check whether the webpage is loading jquery: first create a code sample file; then use the statement "if(typeof jQuery != 'undefined'){...}" to determine whether jquery is loaded.
The operating environment of this tutorial: windows7 system, jquery1.7.2&&html5 version, Dell G3 computer.
Recommended: jquery video tutorial
Directly upload the code, if you don’t believe me, test it yourself.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jquery</title>
</head>
<body>
<h5>判断jquery是否加载</h5>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<script type="text/javascript">
if(typeof jQuery != 'undefined') {
alert("jquery已经被加载");
} else {
alert("jquery没有被加载");
}
</script>
</body>
</html>Mainly talk about two points:
1. There are pictures and the truth
2. You can determine whether to import it by annotating jquery.
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