Method: 1. Use it in the event attribute of the tag, the syntax ""; 2. Write it in the script tag pair, the syntax ""; 3. Use the "" statement.
The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, Dell G3 computer.
The usage of js is similar to css:
1. Inline
Use "";
<body onload="alert('hello world3')";>
</body>
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## in the label attribute
#2. Embedded
Use script tag directly
<script>
alert("hello world2");
</script>Copy after login
3. Linked
Use
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