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https://blog.csdn.net/qilixiang012/article/details/26688393
The first: node embedded in html
<html>
<body>
<input type="button" onclick="document.body.style.backgroundColor='lavender';"
value="Change background color" />
</body>
</html>
Another: Call method
<html>
<body>
<script>
function ChangeBackground()
{
document.body.style.backgroundColor="lavender";
}
</script>
<input type="button" onclick="ChangeBackground()"
value="Change background color" />
</body>
</html>Third: Import js file
<script src＝“url” type="text/javascript"></script>