JavaScript : substring vs. substr

String.substring(start-index,stop-index)

 start-index: (Required - Numeric Value) - where to start the extraction

 stop-index : (Optional - Numeric Value) - where to stop the extraction

    var str = "Hello World";
    document.write(str.substring(4,8));

 
 
 
String.substr(start-index,length)

 start-index: (Required - Numeric Value) - where to start the extraction

 length : (Optional - Numeric Value) - how many characters to extract

    var str = "Hello World";
    document.write(str.substr(4,4));

  
 
Since JavaScript substr() is not cross-browser, I never use it.
 
 
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