Javascript is executed only when the page Dom model is loaded.
You cannot use <body onload = ""> In addition, defer is equivalent to executing after the page is completely in, which is equivalent to window. onload, but the application is more flexible than window. onload.
CopyCodeThe Code is as follows: <! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> untitled document </title>
</Head>
<Body>
<SCRIPT defer = "Defer">
Alert ("executed after page loading ")
</SCRIPT>
First, we can see this section and then execute the above Js. If we remove defer = "Defer" above, we will first execute js to see this section.
</Body>
</Html>
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