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Some definitions of JavaScript


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What is string?What is parameter?What is parentheses () ? Please see the following codes: <html><head><script type="text/javascript">function show_prompt(){var name=prompt("Please enter your name","Harry Potter");if (name!=null && name!="") { document.write("Hello " + name + "! How are you today?"); }}</script></head><body> <input type="button" onClick="show_prompt()" value="Show a prompt box" /> </body></html> name!=null && name!="" is included here.Here what is the meaning of null?Here what is the meaning of “”? Thank you.

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