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---restore content starts---
<body>
<p id= "Demo" > This is a </p>
<script>
function my () {
X=document.getelementbyid ("demo");//Find elements
X.innerhtml= "Hello";//Modify Content
}
</script>
<button type= "button" onclick= "My ()" > click here </button>
</body>
<! DOCTYPE html>
<body>
<script>
function Changeimage ()
{
Element=document.getelementbyid (' MyImage ')
if (Element.src.match ("Bulbon"))
{
Element.src= "/i/eg_bulboff.gif";
}
Else
{
Element.src= "/i/eg_bulbon.gif";
}
}
</script>
<p> tap the light bulb to light or turn off the lamp </p>
</body>
You can also save the script to an external file. External files typically contain code that is used by multiple Web pages.
The file name extension for external JavaScript files is. js.
To use an external file, set the. js file in the "src" attribute of the <script> tag:
External scripts cannot contain <script> tags.
Introduction to basic knowledge here, query on demandGetting Started with JavaScript
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