<!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Javascript Function</title> </head> <body> <h1 id="demo"></h1> <h1 id="sum"></h1> <h1 id="sum1"></h1> <script type="text/javascript"> /* function functionName (param1, param2) { function body } */ function printMessage () { document.getElementById("demo").innerHTML = "Hello world"; } function add (num1,num2) { return num1+num2; } printMessage (); document.getElementById("sum").innerHTML = add(100,200); document.getElementById("sum1").innerHTML = add("hello ","world"); </script> </body> </html>
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