How to put the javascript script
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JavaScript scripts can be placed in: 1. HTML body part, JavaScript scripts will be executed when the page loads;2. HTML head part, JavaScript scripts will be executed when invoked.
Operating environment of this tutorial: Windows 7 system, Javascript version 1.8.5, Dell G3 computer.
Location of javascript script:
HTML body section, JavaScripts will be executed when the page loads.
HTML head section, JavaScripts will be executed when called.
Description:
JavaScripts in a page are executed immediately when the browser loads the page. We don't always want this to happen. Sometimes we want a script to execute when the page loads, and sometimes we want a script to execute when the user triggers an event.
Script in the head section: Scripts that need to be invoked or event-triggered are placed in the head section of HTML. When you put scripts in the head section, you can guarantee that scripts are loaded before any calls.
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