Common JavaScript methods and techniques

This article focuses on common JavaScript methods and techniques, including creating script blocks, hiding script code, and linking external script files, I hope you will have some knowledge about JavaScript methods and techniques through this article.

Common JavaScript methods and techniques

Create a script block

 
 

  
  
1<scriptlanguagescriptlanguage=”JavaScript”> 
  
  
2JavaScriptcodegoeshere  
  
  
3</script> 
 
 

Hide script code

 
 

  
  
1<scriptlanguagescriptlanguage=”JavaScript”> 
  
  
2<!--  
  
  
3document.write(“Hello”);  
  
  
4--> 
  
  
5</script> 
 
 

Display when the browser does not support

 
 

  
  
1<noscript> 
  
  
2Hellotothenon-JavaScriptbrowser.  
  
  
3</noscript> 
 
 

Link external script file

 
 

  
  
1<scriptlanguagescriptlanguage=”JavaScript”src="/”filename.js"”> 
  
  
 
  
  
</script> 
 
 

JavaScript method annotation script

 
 

  
  
1//Thisisacomment  
  
  
2document.write(“Hello”);//Thisisacomment  
  
  
3/*  
  
  
4Allofthis  
  
  
5isacomment  
  
  
6*/ 
 
 

Output to Browser

 
 

  
  
1document.write(“<strong>Hello</strong>”); 
  
  
 
 
 

Define Variables

 
 

  
  
1varmyVariable=“somevalue”;  
  
  
 
 
 

String Addition

 
 

  
  
1varmyString=“String1”+“String2”;  
  
  
 
 
 

String search using JavaScript Methods

 
 

  
  
1<scriptlanguagescriptlanguage=”JavaScript”> 
  
  
2varmyVariable=“Hellothere”;  
  
  
3vartherePlace=myVariable.search(“there”);  
  
  
4document.write(therePlace);  
  
  
5</script> 
 
 

String replacement

 
 

  
  
1<scriptlanguagescriptlanguage=”JavaScript”> 
  
  
2thisVar.replace(“Monday”,”Friday”);  
  
  
3</script>